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Safety-critical technical reference — read before use. Independent educational guidance for qualified AGL and aerodrome personnel. It is not an approved procedure, design, specification or regulatory instruction and does not replace your aerodrome’s permit-to-work, isolation/LOTO procedures, the approved design or the manufacturer’s instructions. Series-circuit AGL equipment can carry lethal voltages. Read the full disclaimer ↓
Precision AGL Academy · Airfield Markings & Signage Integration

Airfield Markings & Signage Integration

A deep dive into the integration of pavement markings, signs, lighting and surface movement guidance. Markings, signage, lighting and control are not independent visual elements — a pilot or vehicle operator experiences them together, as one system. The engineer's job is to make sure that system always tells one consistent, unambiguous story.

Mark → Identify → Guide → Warn → Control → Verify

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Core Principle

Markings and Signage Are Not Independent Elements

Airfield markings and signage work together with runway and taxiway markings, apron markings, mandatory, location, direction and information signs, runway and taxiway lighting, runway guard lights, stop bars, taxiway centreline lighting, stand guidance systems, ALCMS, SMGCS, A-SMGCS, ATC procedures, and pilot and vehicle-operator awareness.

The fundamental engineering chain is: Markings → Signs → Lighting → Guidance → Control → Recognition → Safe Movement.

The objective is to ensure that an aircraft or vehicle can always answer: Where am I? Where am I going? What route should I follow? Where must I stop? What runway or taxiway am I approaching? What action is required?

One Combined Picture

A pilot does not experience markings, signs and lighting as separate engineering packages — they are interpreted together.

Weakest-Link System

If one element is incorrectly positioned, poorly maintained or visually confusing, the effectiveness of the overall system can be reduced.

One Consistent Message

The pilot and vehicle operator must receive one clear, consistent and unambiguous visual message at every stage.

Markings & Signage

What Are Markings? What Is Signage?

Airfield Markings

Visual markings applied to pavement or other approved surfaces to provide information and guidance to aircraft and ground vehicles. They can identify the runway, threshold, runway centreline, runway edge, touchdown zone, runway designation, taxiway, taxiway centreline, taxiway edge, holding position, apron, aircraft stand, vehicle movement areas and restricted or protected areas.

Airfield Signage

Signs provide visual information through standardized colours, characters, symbols and positioning. They may communicate mandatory instructions, location, direction, destination, runway identification, taxiway identification, apron or stand information and operational information. Signs complement markings — they do not replace them.

Why It Matters

Why Integration Matters

For example, a taxiway centreline, a location sign, a direction sign and centreline lighting together create one combined navigation reference. A well-designed aerodrome uses a consistent visual language built from Colour + Shape + Character + Position + Lighting + Flashing/Steady State + Contrast — a user should be able to recognize the meaning of a visual element quickly.

Combined Reference

Centreline + location sign + direction sign + centreline lighting form one navigation reference, not four separate ones.

A Visual Language

Colour, shape, character, position, lighting state and contrast together carry standardized meaning.

Reduced Effectiveness

A single incorrectly positioned, poorly maintained or visually confusing element can degrade the whole system.

Markings vs Signs

Markings vs Signs — Feature Comparison

FeatureMarkingsSigns
LocationPavement / surfaceGround-mounted / fixed installation
Primary roleSurface guidanceInformation / instruction
VisibilityViewed on pavementViewed ahead / from cockpit
ExamplesCentreline, thresholdMandatory, location, direction
MaintenancePaint / surface conditionStructure, face, lighting
LightingNot self-illuminated — relies on aircraft lights, apron/area lighting and reflective materials, supported by AGLMay be internally or externally illuminated, depending on sign type and requirement
Marking Categories

Runway, Taxiway & Apron Markings

Exact marking arrangements depend on runway category, configuration and applicable requirements — the categories below outline the elements an engineer needs to coordinate.

Runway Markings

Designation, centreline, threshold, threshold markings, touchdown zone, runway edge, aiming point and displaced threshold, plus other approved operational information.

Taxiway Markings

Taxiway centreline, edge markings where required, holding-position markings, intermediate holding positions, taxiway intersection markings and apron transition markings.

Apron Markings

Stand centreline, lead-in line, stop position, equipment limits, vehicle routes, safety areas and service areas — coordinated with aircraft stand geometry.

Markings and lights on the runway approach
PLAN VIEW · APPROACH END OF A RUNWAY · MARKINGS AND LIGHTS ON ONE LAYOUT 27 THRESHOLDSTRIPES + GREEN LIGHTS CENTRELINEDASHES + WHITE LIGHTS TOUCHDOWN ZONEMARKING + BARRETTES EDGESSIDE STRIPES + WHITE LIGHTS TO FAR END → BY DAY · MARKINGSPaint and beads draw the layout BY NIGHT · LIGHTSLights draw the same layout, and add colour TOGETHER · ONE SET-OUTSame survey, each cue backs up the other SAME RUNWAY, SAME GEOMETRY · READ BY DAY, BY NIGHT AND IN LOW VISIBILITY
Figure 1. Plan view of a runway approach end: threshold stripes, runway number, dashed centreline and the lighting that works with them.
AGL Visual Encyclopedia: Runway markings and lighting integration Runway lighting pattern
Airmen painting runway markings with reflective paint
Photo 1. Airmen paint runway markings. The paint is mixed with reflective beads so pilots can see the markings.Credit: U.S. Air Force photo by Tech. Sgt. Nicholas Rau (VIRIN 151022-F-EB935-005). Public domain (U.S. Government work). Source page
Sign Categories

Mandatory, Location, Direction & Information Signs

Mandatory Signs

Communicate instructions that must be followed — runway entry, runway identification, holding positions, no-entry areas and other mandatory operational restrictions. Colour, character, location and lighting must follow applicable requirements.

Location Signs

Identify the taxiway, runway or other aerodrome location where the aircraft is positioned. They answer Where am I? and are particularly valuable for situational awareness.

Direction Signs

Indicate routes toward destinations, answering Where should I go? They matter most at complex taxiway intersections.

Information Signs

Provide other operational information, such as runway exit, runway-vacated or destination information — exact use depends on airport configuration and applicable standards.

Classification note: The four cards describe operational functions. In ICAO Annex 14 the formal grouping is two classes — mandatory instruction signs and information signs; location, direction and destination signs are all types of information sign. Confirm the classification and colours against the current applicable standard and the approved project design.
Four sign types
FOUR SIGNS · SAME AIRFIELD, DIFFERENT MESSAGES MANDATORY SIGN the stop sign 27-09 WHITE ON RED marks a limit not to cross at the holding position hold until ATC clears you LOCATION SIGN where you are A YELLOW ON BLACK names taxiway or runway at or just past intersection confirms position only DIRECTION SIGN which way next B BLACK ON YELLOW names the next taxiway before the intersection arrow follows the turn DESTINATION SIGN which way to an area CARGO BLACK ON YELLOW names a functional area same format as direction sign points toward the area
Figure 2. Mandatory, location, direction and destination signs in schematic.
AGL Visual Encyclopedia: Different signs Mandatory signs Location signs Direction signs
Runway, Threshold & Taxiway Centreline

Runway Designation, Threshold & Centreline

Designation, Identification & Threshold

Runway designation markings let pilots identify the runway from its magnetic orientation, and must correspond with published aerodrome information, orientation, approved markings, signs, lighting and operational documentation. Changes require coordinated review.

Threshold markings identify the start of the landing portion of runway. Their relationship with threshold lights, runway edge lights, centreline lights, approach lighting and threshold identification must be considered as one integrated system.

Taxiway Centreline & Holding Positions

The taxiway centreline is the primary surface route for taxiing aircraft — especially important during night operations, reduced visibility, complex intersections, high traffic conditions and low-visibility procedures.

Holding-position markings indicate where an aircraft or vehicle must hold before entering a protected area. Their importance increases at runway entrances, taxiway intersections, critical protected areas and low-visibility operating locations.

Standard and displaced threshold
A · STANDARD THRESHOLD · PLAN VIEW, APPROACH FROM THE LEFT 09 THRESHOLD LIGHTS · GREEN BAR ACROSS THE RUNWAY, WING BARS BESIDE IT THRESHOLD MARKING · WHITE STRIPES, SYMMETRIC ABOUT THE CENTRELINE RUNWAY NUMBER FOLLOWS THE STRIPES · LANDING BEGINS AT THE THRESHOLD B · DISPLACED THRESHOLD · SAME RUNWAY, LANDING BEGINS FARTHER ALONG DISPLACED AREA · NOT FOR LANDING 09 GREEN BAR AND WING BARS AT THE DISPLACED POSITION THRESHOLD BAR · WHITE, ACROSS THE RUNWAY LANDING BEGINS HERE RED EDGE LIGHTS · FROM THE APPROACH CENTRELINE ARROWS · LEAD TO THE BAR Runway end lights stay at the physical runway end. Approach lights, PAPI and TDZ lights follow the displaced threshold.
Figure 3. Two views of the same runway: a standard threshold and a displaced threshold, with markings and lights.
AGL Visual Encyclopedia: Threshold and displaced threshold Runway designation signs
Taxiway centreline marking and lights
PLAN VIEW · TAXIWAY CENTRELINE MARKING AND LIGHTS ON ONE PATH RUNWAY RUNWAY STRIP · ALTERNATE GREEN / YELLOW MARKING · CONTINUOUS YELLOW LINE LIGHTS · GREEN, ON THE LINE CURVE · SAME PATH, CLOSER SPACING DETAIL · LIGHT AGAINST THE MARKING ≤ 30 cm ON THE LINE OFFSET, KEPT UNIFORM MARKINGContinuous yellow line sets the path LIGHTSGreen lights trace that same path ALIGNMENTOn the line, or offset ≤ 30 cm and uniform THE PAINTED LINE AND THE LIT LINE MUST BE ONE LINE · BY DAY AND BY NIGHT
Figure 4. A taxiway curving onto the runway centreline: the marking and the lights must follow the same line.
AGL Visual Encyclopedia: Centreline marking and light alignment Taxiway centreline lights
Colour as a Safety Language

Colour, Marking Colour & Contrast

Colour provides immediate visual classification — the engineer must not treat sign or marking colours as aesthetic choices. Colour is part of the standardized meaning of the sign or marking: Colour → Meaning → Recognition → Action. The correct colour must be specified, procured, applied, maintained and inspected — colour deterioration can reduce recognition even when the physical marking remains visible.

Pavement condition
Rubber deposits
Dirt
Standing water
Faded paint
Lighting conditions
Surface contamination
Colour as a safety language
COLOUR → MEANING → RECOGNITION → ACTIONSIGNS09 – 27MandatoryMust be followedALocationWhere am I?B →DirectionWhere should I go?INFOInformationOperational informationMARKINGSrunway sidehold sideRunway markings — whiteTaxiway centreline — yellowHolding position — yellow
Colour carries standardized meaning, not decoration — it must be specified, procured, applied, maintained and inspected. Legends shown are examples; confirm scheme and details against ICAO Annex 14 or the applicable national requirement.
Lighting Interaction

How Lighting Interacts With Markings & Signs

A marking may be physically correct but difficult to recognize under poor lighting — Marking Performance ≠ Lighting Performance. Both need to be considered together, and lighting must not produce excessive glare, reflections, confusing visual patterns or reduced character contrast.

AIRPORT GEOMETRY
MARKINGS
SIGNS
LIGHTING
PILOT / VEHICLE-OPERATOR RECOGNITION
SAFE GROUND MOVEMENT
The same threshold by day, at night and in low visibility
THE SAME APPROACH TO A THRESHOLD, VIEWED FROM THE COCKPIT IN THREE CONDITIONS DAY · PAINT DOES THE WORK NIGHT · LIGHTS TAKE OVER LOW VISIBILITY · BRIGHTER LIGHTS Full pattern readable to the far end. White paint is high contrast on dark pavement. Lights are on but washed out. Paint is seen only nearby, in aircraft lights. Edge and threshold lights show the whole runway outline from a long way off. Fog hides the far end. Lights are set to a high step, and centreline and touchdown zone lights add the missing cues. RETROREFLECTIVE PAINT HELPS NEAR THE AIRCRAFT, BUT ONLY LIGHTS CARRY THE PATTERN FAR AHEAD
Figure 5. Cockpit views of one runway threshold in three conditions.
AGL Visual Encyclopedia: Marking and light visibility Intensity step selection
Integrated Concepts

Stop Bars, Runway Guard Lights & Holding Positions

Holding Position + Stop Bar + RGL + Sign

Stop bars are closely associated with runway holding positions. A typical integrated concept combines the holding position marking, the stop bar, the runway guard light and the mandatory sign — each component contributing a different visual cue. A lit stop bar is an instruction to stop: it is extinguished by ATC to permit movement, and must not be crossed while lit.

Runway Guard Lights & Signs

Runway Guard Lights provide conspicuous visual warning of the runway environment, complementing holding-position markings, mandatory signs, stop bars and taxiway centreline guidance. They should never be treated as a substitute for correct pavement markings or signage.

Holding position marking, sign and lights together
PLAN VIEW · RUNWAY HOLDING POSITION · MARKING, SIGN AND LIGHTS AT ONE LINE RUNWAY 27-09 27-09 LEFT PAIRRIGHT PAIR MARKING · TWO SOLID, TWO DASHED LINES SOLID LINES ON THE AIRCRAFT SIDE SIGN · WHITE ON RED, BOTH SIDES GUARD LIGHTS · 2 EACH SIDE, FLASH ALTERNATELY BEYOND THE BAR · CENTRELINE OFF STOP BAR · STEADY RED, ATC SWITCHED BELOW THE BAR · GREEN CENTRELINE BY DAY · MARKING AND SIGNShow where the aircraft must hold AT NIGHT · LIGHTS ADDStop bar and guard lights command the hold TOGETHER · ONE LINEAny cue backs up the rest if one fails ONE HOLDING POSITION · MARKING, SIGN AND LIGHTS READ AS ONE INSTRUCTION
Figure 6. A taxiway meeting a runway: the marking, the sign and the lights at the holding position.
AGL Visual Encyclopedia: Holding position marking, signs and lights Stop bar lights
Stop bar control
RUNWAY STOP BAR · RED · ON CENTRELINE · OFF HOLDS SHORT 1 · STOP BAR ON — HOLD RUNWAY STOP BAR · OFF CENTRELINE · GREEN CLEARED TO CROSS 2 · STOP BAR OFF — PROCEED ATCCLEARS ATC CONTROLLERTOWER PANEL · A-SMGCSSENDS ON / OFF COMMAND ALCMSINTERLOCK LOGICLINKS BAR TO CENTRELINE FIELD CONTROLLERSWITCHING UNITSWITCHES THE RIGHT BAR STOP BAR CIRCUITSEPARATELY SWITCHEDFEEDS ONE BAR ONLY LIGHTS ON TAXIWAYBAR + CENTRELINEPILOT SEES THE RESULT STATUS FEEDBACK · BAR LIT OR OFF · LAMP FAULTS → CONTROLLER DEFAULT: BAR ON, CENTRELINE OFF · CLEARANCE SWAPS THEM · BAR RETURNS AFTER CROSSING
Figure 7. Two views of a runway holding position with the control chain below. Both views are shown together here.
AGL Visual Encyclopedia: Stop bar control Stop bar monitoring
Runway guard lights
TAXIWAY / RUNWAY INTERSECTION RUNWAY RUNWAY CENTRELINE (SECONDARY) RUNWAY EDGE LIGHTS (SECONDARY) TAXIWAY CENTRELINE LIGHTS (SECONDARY) TAXIWAY DIRECTION OF TAXI → TOWARD RUNWAY RUNWAY HOLDING POSITION MARKING RUNWAY GUARD LIGHTS PAIR ON EACH SIDE · FLASHING SCHEMATIC VIEW OF A TAXIWAY/RUNWAY INTERSECTION · FIXTURE COUNT AND SPACING ILLUSTRATIVE · NOT TO SCALE
Figure 8. Flashing yellow guard lights at a runway holding position. Flashing lights are shown lit.
AGL Visual Encyclopedia: Runway guard lights
Apron & Stand Integration

Apron Stand & VDGS Integration

At an aircraft stand, the complete guidance system may be formed by Stand Number + Lead-In Marking + Stand Centreline + Stop Position + VDGS + Apron Lighting. Every element must refer to the same approved aircraft parking geometry — a VDGS should always correspond with the physical stand markings.

Centreline & Stop Position

The stand centreline and stop position must match the docking reference and aircraft type configuration.

PBB & Clearance

Passenger boarding bridge position and ground equipment clearance must stay consistent with the marked geometry.

Aircraft Type

VDGS aircraft type selection must correspond with the approved stand drawing before a docking is presented as valid.

One aircraft stand
TERMINAL BUILDINGDOCKING GUIDANCESTOP POSITION LIGHTSFLOODLIGHT MASTLEAD-IN GUIDANCETAXILANE CENTRELINEHANDOVER POINTPLAN VIEW · ILLUSTRATIVE, NOT TO SCALE
Figure 9. Lead-in line, guidance lights and stand markings on one aircraft stand.
AGL Visual Encyclopedia: Aircraft stand lighting interface Stand and gate identification signs
VDGS and the stand
1 · IN — WHAT THE VDGS IS TOLD 2 · THE VDGS 3 · OUT — WHAT IT REPORTS STAND ALLOCATIONEXPECTED TYPE AND FLIGHT BOARDING BRIDGEPARKED OR NOT EMERGENCY STOPSTAFF STOP THE DOCKING VDGS SENSOR · DISPLAY · CONTROLLER DISPLAY GUIDES ONLY WHEN THE STAND IS READY FOR IT NO SIGNAL → DEFINED SAFE STATE NOT A GUESS AIRPORT OPERATIONSSTAND STATUS, RECORDS BRIDGE, GROUND STAFFDOCKED, AIRCRAFT STOPPED MONITORINGFAULT AND HEALTH 4 · THE STAND AROUND IT APRON AND STAND LIGHTINGGLARE AND DISPLAY BRIGHTNESS POWER AND NETWORKSUPPLY, LINKS, TIME LOSE A LINK → CLEAR INDICATION, THEN STAND PROCEDURES THE PILOT STAYS RESPONSIBLE FOR A SAFE STOP TOLD THE TYPE · CHECKS THE BRIDGE · OBEYS THE STOP · REPORTS THE STAND STATUS
Figure 10. Inputs to the docking system and how it interfaces with the stand.
AGL Visual Encyclopedia: VDGS interface with stand and apron
Control & Surface Movement Guidance

ALCMS, SMGCS & A-SMGCS Integration

The engineer should distinguish between Field Visual Condition and Control System Indication — a control screen showing "ON" does not necessarily prove the field element is visually performing correctly.

Control indication vs field visual condition
CONTROL SCREEN INDICATIONSign panel A3ONStop bar SB2ONCircuit 4NORMAL≠FIELD VISUAL CONDITION — EXAMPLESDirty or obscured sign faceFaded or worn paintRubber deposits over markingMisaligned or degraded luminaireLamp failure not individually monitoredConfirmed only by field inspection and measurementControl status supports — but never replaces — visual verification
A control screen showing “ON” does not by itself prove that a sign, marking or light is performing correctly in the field.

ALCMS Integration

ALCMS may provide lighting control, circuit status, alarm monitoring, switching, event logging and system supervision. Integration should be based on the approved control architecture.

SMGCS & A-SMGCS

Markings and signs are fundamental components of Surface Movement Guidance and Control: Markings + Signs + Lighting + Stop Bars + RGL + ATC + Procedures. A-SMGCS airports add surveillance, identification, routing, guidance and conflict alerting on top of this visual layer.

Surface movement guidance — layered view
A-SMGCS LAYER (larger airports)surveillance · identification · routing · guidance · conflict alertingATC & PROCEDURESclearances · routing instructions · low-visibility proceduresVISUAL LAYERmarkings · signs · lighting · stop bars · runway guard lightsbuilds on
Markings and signs are fundamental components of surface movement guidance; A-SMGCS adds surveillance, identification, routing, guidance and alerting on top of the visual layer.
Runway Incursion Prevention

Runway Incursion Prevention Model

Markings and signage are critical layers of runway incursion prevention. A typical protection model:

Holding Position
Mandatory Sign
Stop Bar
Runway Guard Light
ATC Clearance
Pilot Recognition

ATC clearance remains the operational authority — the visual layers reinforce it and never replace it. The exact combination depends on the aerodrome's approved system and operating procedures. During low visibility, taxiway routing becomes harder to recognize, intersection complexity increases, lighting becomes more important, signs must remain readable, and control and monitoring become more critical — the complete system must be designed as one integrated visual and operational system.

Runway status lights
PLAN VIEW · RED MEANS THE RUNWAY IS NOT SAFE RUNWAY TAKE-OFF HOLD LIGHTS · RED HOLDING AT THE START LIGHTS RED · DO NOT GO RUNWAY ENTRANCE LIGHTS · RED HOLDS SHORT AIRCRAFT ON RUNWAY SURVEILLANCERADAR · MLAT · ADS-BSEES THE TRAFFIC RWSL LOGICTRACKS · CHECKSIS THE RUNWAY SAFE? LIGHT CONTROLSWITCHES THE CIRCUITSLIGHTS THE RIGHT ONES STATUS LIGHTSRED · IN THE PAVEMENTSHOW STOP PILOTSTOPS AND CALLS ATCTHE FINAL DEFENCE AUTOMATIC · NO CONTROLLER INPUT NEEDED · A SAFETY NET ON TOP OF THE CLEARANCE
Figure 11. An aircraft rolling on the runway and the lights that show a taxiing aircraft it is not safe to enter.
AGL Visual Encyclopedia: Runway status lights Runway entrance lights Runway occupancy sensing
Hot Spots & Complex Intersections

Hot Spots & Complex Taxiway Intersections

Aerodrome hot spots are areas where aircraft navigation or runway-incursion risk may be elevated. Complex intersections require particularly careful coordination, and the sign sequence should provide understandable information conceptually: Current Location → Available Direction → Destination. Incorrect or poorly positioned signs can create route ambiguity.

Marking Clarity

Assess whether centreline geometry is unambiguous at the intersection.

Sign Placement & Sequence

Location, then direction, then destination information in the correct order.

Pilot Sightlines

Verify viewing angle, cockpit height and obstructions at the sign position.

Operational Procedures

Confirm procedures match the physical layout, not just the drawing.

A taxiway crossing
TAXIWAY / TAXIWAY CROSSING CROSSING POINT INTERMEDIATE HOLDING POSITION LIGHTS WHERE ATC NEEDS A HOLD · YELLOW EDGE LIGHTS FOLLOW THE OUTLINE NONE INSIDE THE CROSSING EACH TURN GETS ITS OWN CURVE WITH CLOSER SPACING SCHEMATIC VIEW OF A TAXIWAY/TAXIWAY CROSSING · FIXTURE COUNT, CURVE RADIUS, AND SPACING ILLUSTRATIVE · NOT TO SCALE
Figure 12. Two taxiways crossing straight, giving four approaches to one intersection.
AGL Visual Encyclopedia: Taxiway crossing Runway intersection lighting
Sign Positioning & Consistency

Sign Positioning, Orientation & System Consistency

Positioning & Orientation

Sign placement must consider pilot viewing angle, aircraft cockpit height, taxiway geometry, holding position, centreline, obstructions, maintenance access and frangibility requirements where applicable. Poor orientation can cause reduced readability, delayed recognition, reflection and misinterpretation.

Marking Alignment & Consistency

A centreline that does not match the intended aircraft path can create an operational hazard — paint must represent the approved geometry, not merely the available pavement. Drawing, marking, sign, lighting and published information must all agree; any mismatch requires investigation and controlled correction.

Sign positioning and visibility
Approaching aircraftSign face orientedtoward approaching trafficObstructionequipment · vegetationPartly blocked view → delayed recognitionViewing angleFrangible mounting where required · maintenance accessCockpit eye height and viewing angle set what the crew can read — both must be checked at the intended approach path.
Schematic plan view. Placement must consider viewing angle, cockpit height, taxiway geometry, holding positions, centreline, obstructions, maintenance access and frangibility requirements where applicable.
The consistency principle
Approved drawingsMarkingsSignsLightingPublished informationONEconsistent pictureDrawing, marking, sign, lighting and published information must all agree — any mismatch requires engineering review.
Paint must represent the approved geometry, not merely the available pavement. A change to any one element needs coordinated review of all the others.
Seeing the sign from the taxiing aircraft
SIGN VISIBILITY 1 A CLEAR LINE OF SIGHT (PLAN VIEW) TAXIWAY AIRCRAFT CLEAR VIEW OF THE FACE Nothing between eye and face: no vegetation, snow, vehicle or other sign. 2 LEGEND SIZE SETS THE READING DISTANCE B200 mm legendB300 mm legendB400 mm legend SMALLER: READ CLOSER LARGER: READ FROM FURTHER Face height is at least twice the legend height. 3 WHAT MAKES A SIGN READABLE, AND WHAT TAKES IT AWAY Luminance Lit face, even glow Dim LEDs, failed lamp Contrast Black on yellow, or reverse Faded, dirty, fogged face Line of sight Clear view of the face Plants, snow, vehicles Glare Shaded, no hot spots Sun or lights on the face All four must hold at once. A good face behind a hedge, or a clean face with a failed lamp, is still a poor sign. SCHEMATIC · PROPORTIONS ILLUSTRATIVE · NOT TO SCALE
Figure 13. Line of sight, obstruction and orientation as they affect sign visibility.
AGL Visual Encyclopedia: Sign visibility Sign alignment
Construction & Change

Temporary Arrangements, Construction & Change Management

Construction and temporary operational arrangements may require temporary markings, temporary signs, barricades, lighting, closure information and operational restrictions, all controlled through the airport's approved procedures. Before opening an affected area, verify markings, signs, lighting, centreline, holding positions, obstructions, surface condition and operational information. After resurfacing, markings may need to be removed, re-established, re-aligned, re-measured and visually inspected, and lighting fixtures and signs may also need adjustment.

Changes to one visual system can affect others: Taxiway Relocation → Centreline Change → Marking Change → Sign Change → Lighting Change → ALCMS Configuration Change. Changes should therefore always be reviewed as an integrated package.

Temporary runway lighting for works
PLAN VIEW · A TEMPORARILY DISPLACED THRESHOLD, AND THE PORTABLE LIGHTS THAT MARK IT A · RUNWAY WITH WORKS AT THE APPROACH END EDGE LIGHTS · RED TO APPROACH TEMPORARY THRESHOLD · GREEN EDGE LIGHTS · WHITE BEFORE THE NEW THRESHOLD · WORKS AVAILABLE FOR LANDING LANDING DIRECTION → B · ONE PORTABLE LIGHT, AND WHAT EACH COLOUR IS FOR LED LAMP HEAD · COLOUR SET BY FUNCTION LOW, FRANGIBLE STEM · BREAKS IF STRUCK BATTERY OR SOLAR · FULL NIGHT WEIGHTED BASE · WIND AND JET BLAST COLOUR BY FUNCTION WHITE · RUNWAY EDGE GREEN · THRESHOLD RED · RUNWAY END, CLOSED AREAS BLUE · TAXIWAY EDGE C · THE LIFE OF A TEMPORARY INSTALLATION 1 · APPROVE SAFETY ASSESSMENT 2 · NOTIFY NOTAM AND ATC 3 · SET OUT POSITION, COLOUR, AIM 4 · INSPECT DAILY CHARGE, LENS, STABILITY 5 · REMOVE RESTORE AND TEST THE TEMPORARY PICTURE MUST MATCH THE APPROVED PLAN · AND COME DOWN WHEN THE WORKS END
Figure 14. Plan of a runway with a displaced threshold for works, with temporary lighting.
AGL Visual Encyclopedia: Temporary runway lighting for works Closed runway marking lights
Crew spraying yellow paint on a runway to change its marked length
Photo 2. A crew sprays yellow paint onto a runway. The airfield was closed so markings could be repainted and lights moved and adjusted for the shortened runway.Credit: U.S. Air Force photo by Senior Airman Zachary Cacicia (VIRIN 160226-F-BF612-097). Public domain (U.S. Government work). Source page
Maintenance & Inspection

Inspection, Contamination & Damage

A marking should be assessed against applicable maintenance criteria, not simply whether some paint remains visible. Rubber deposits and pavement contamination reduce visual contrast; faded markings reduce recognition, centreline tracking and daytime visibility, and cause confusion at intersections.

Day Inspection

Focuses heavily on markings, sign faces, colour, pavement contrast, physical positioning and surface condition.

Night Inspection

Particularly useful for evaluating sign illumination, taxiway and runway lighting, stop bars, runway guard lights, apron lighting, glare and visual continuity.

Damaged Signs May Show

Cracked face
Damaged characters
Internal lighting failure
Water ingress
Corrosion
Structural damage
Incorrect orientation
What an inspection should find on a sign
SIGN INSPECTION1 WHAT IS LOOKED ATA B1234561Face and legendClean, undamaged, correct2HousingSeals, cracks, no water inside3MountFasteners, frangible legs sound4Ground and baseCover seated, no heave or standing water5View and alignmentUpright, facing right, not blocked6Lit at nightWhole message even and legible2 WHEN AND HOWDAYTIMESeen as a pilot or driver seesNIGHTWhole message lit and legibleCLOSE-UPSeals, fasteners and baseDEFECT FOUNDRecord, grade and report itLooking from outside needs no isolation. Opening the sign does: isolate, lock out and prove dead first.SCHEMATIC · POINTS ILLUSTRATIVE · INTERVALS SET BY THE SITE INSPECTION PROGRAMME
Figure 15. Six numbered inspection points on one sign.
AGL Visual Encyclopedia: Sign inspection Sign maintenance
Machine stripping paint from a runway
Photo 3. A machine strips paint from a runway. Removal and repainting have to be planned with the lighting and signs.Credit: U.S. Air Force photo by Senior Airman Sheila deVera (VIRIN 110201-F-7705D-043). Public domain (U.S. Government work). Source page
Testing & Verification

Electrical Testing & Photometric Verification

Electrical testing may apply to illuminated signs and lighting systems — supply, current, insulation resistance where applicable, earth continuity, earthing, protective devices, cable integrity and control operation, all following the applicable ITP and equipment requirements. Photometric testing may apply where optical performance is specified — intensity, colour, beam alignment, coverage and uniformity, using a test method matched to the equipment and applicable requirement.

InspectionPrimary Measurement
MarkingsPhysical / visual condition
Sign faceCharacter / colour / visibility
Illuminated signElectrical + visual / photometric as applicable
Runway lightPhotometric performance
Taxiway lightPhotometric performance
Apron floodlightIlluminance / uniformity
Marking inspection and photometry are different disciplines — a marking can look correct to the eye while still failing an applicable photometric or contrast criterion, and vice versa.
Four checks, one acceptance decision
THE 4Cs · ACCEPTANCE DECISIONCOLOURChromaticityCANDELAIntensityCOVERAGEBeam spread and aimCONFIGURATIONPlacement and layoutALL FOURMEET?YESNOACCEPTREJECTINVESTIGATERETEST123451COLOURChromaticity within its region2CANDELAIntensity meets the requirement3COVERAGEBeam spread and aim are correct4CONFIGURATIONPlacement, spacing, layout5DECISIONEvery C must pass to acceptSCHEMATIC · THE ACTUAL CRITERIA COME FROM THE STANDARD AND THE PROCEDURE
Figure 16. Photometric acceptance: colour, candela, coverage and configuration.
AGL Visual Encyclopedia: Photometric acceptance Sign testing
Common Integration Failures

Common Integration Failures & Likely Causes

Click each item to see the typical root cause worth checking first.

Sign does not match marking

Likely Cause

  • Drawing / configuration mismatch
  • Unreviewed field change

Centreline does not match sign

Likely Cause

  • Layout change not propagated to signage

Stop bar not aligned with holding position

Likely Cause

  • Installation error
  • Design coordination error

VDGS stop position differs from marking

Likely Cause

  • VDGS configuration mismatch with stand drawing

Sign unreadable at night

Likely Cause

  • Illumination failure

Marking difficult to see

Likely Cause

  • Fading
  • Contamination

Lighting route differs from marking

Likely Cause

  • Incorrect installation

ALCMS status incorrect

Likely Cause

  • Control / monitoring configuration error
Troubleshooting Philosophy

How to Investigate a Visual Guidance Problem

When a visual guidance problem is reported, do not inspect only the failed component. Work through the chain to identify whether the problem is physical, electrical, optical, configuration-related or operational:

Location
Marking
Sign
Lighting
Control
Geometry
Procedure

Example: Taxiway Confusion

Symptom: Pilot reports difficulty identifying the correct taxiway.

Investigation: Check the centreline, the location sign, the direction signs, sign visibility, lighting, intersection geometry, published information and operational procedure — the problem may not be a single failed component.

Example: Stop Position Mismatch

Symptom: VDGS indicates STOP at a location different from the painted stand stop position.

Investigation: Check the approved stand drawing, aircraft type configuration, VDGS coordinates, stand centreline, stop-position marking, PBB position and recent construction — this is a configuration-control problem as much as an equipment problem.

Classify every finding the same way
INSPECTION DECISION FLOW · SAFETY IS ALWAYS ASKED FIRST ASK IN ORDER · STOP AT THE FIRST YES 1 FINDING SAFETY HAZARD or lost function? 2 FUNCTION / OUTPUT reduced or growing? 3 ANY CHANGE from baseline? 4 NO NO NO YES CRITICAL REPORT · MAKE SAFE Then repair YES MAJOR PLAN REPAIR Re-check after repair YES MINOR RECORD · MONITOR Watch at next cycle NORMAL ROUTINE CYCLE RECORD · CLASSIFY · GRADE EVERY BRANCH ENDS WITH A RECORDED DECISION 5 IN DOUBT · TAKE THE MORE SERIOUS BRANCH SCHEMATIC · EXAMPLE FLOW ONLY · NOT TO SCALE
Figure 17. Inspection decision flow: safety first, then critical, major or minor.
AGL Visual Encyclopedia: Inspection decision flow Fault-isolation flowchart
Commissioning

Integrated Commissioning Sequence

Commissioning should verify more than equipment energization — it should confirm marking geometry, sign positioning, lighting position and operation, control, monitoring, guidance sequence, holding positions, stand guidance and operational interfaces.

1

Install

Place markings, signs and lighting to the approved drawings.

2

Align

Verify geometry against the approved aerodrome layout.

3

Connect

Complete electrical and control connections for illuminated elements.

4

Configure

Set control logic, VDGS parameters and ALCMS mapping.

5

Test

Electrical and, where applicable, photometric testing.

6

Integrate

Confirm markings, signs, lighting and control present one consistent message.

7

Inspect

Day and night inspection of the combined system.

8

Verify

Confirm operational readiness against the approved design.

9

Document

Update as-built drawings, inspection and test reports.

10

Release

Hand over for operational service.

Static checks first, then power on
PRE-COMMISSIONING · STATIC CHECKS BEFORE POWER DE-ENERGISED · CCR LOCKED OUT · NO LIVE TESTS 1 DOCUMENTS As-built drawings Circuit schedules Permit & test plan RECORD: documents 2 INSTALLATION Fixtures aligned Torque & seating Labels & cleanliness RECORD: inspection 3 CABLES Loop continuity Insulation resistance Joints & connectors RECORD: cable log 4 EARTHING Earth resistance Bonding continuity Earth pits RECORD: earth log 5 EQUIPMENT CCR & controls Transformers & lamps Settings recorded RECORD: settings HOLD POINT READINESS SIGN-OFF · RECORDS REVIEWED 6 OPEN ITEM RECTIFY · RE-TEST CLEARED READY FOR ENERGIZATION SCHEMATIC · CHECK LISTS SHORTENED · NOT TO SCALE
Figure 18. Pre-commissioning sequence ending in a hold point.
AGL Visual Encyclopedia: Pre-commissioning Sign commissioning Final acceptance
Integrated Test Matrix

Integrated Test Matrix

SystemPhysicalVisualElectricalPhotometricFunctionalControlOperational
Runway Markings✓✓–✓*✓–✓
Taxiway Markings✓✓–✓*✓–✓
Signs✓✓✓*✓*✓✓*✓
Runway Lighting✓✓✓✓✓✓✓
Taxiway Lighting✓✓✓✓✓✓✓
Stop Bar✓✓✓✓✓✓✓
RGL✓✓✓✓✓✓✓
VDGS✓✓✓–✓✓✓
* Where applicable — for signs and illuminated elements as specified; for markings, where a retroreflectivity or contrast criterion is specified.
Engineering Checklist

Airfield Visual Guidance Engineering Checklist

Click each item to track your review.

Markings

Runway markings verified
Taxiway markings verified
Holding positions verified
Apron markings verified
Stand markings verified
Alignment verified
Colour / visibility verified
0 / 7 complete

Signs

Mandatory signs verified
Location signs verified
Direction signs verified
Information signs verified
Position verified
Orientation verified
Illumination verified where applicable
0 / 7 complete

Lighting

Runway lighting verified
Taxiway lighting verified
Stop bars verified
Runway guard lights verified
Stand guidance verified
Apron lighting verified
0 / 6 complete

Integration

ALCMS integration verified
A-SMGCS interface verified where applicable
Control logic verified
Monitoring verified
Fault alarms verified
Operational procedures reviewed
0 / 6 complete
The Complete Model

Complete Airfield Visual Guidance Model

The engineering chain runs Survey → Design → Mark → Sign → Light → Control → Integrate → Test → Inspect → Verify → Maintain, applied consistently at every stage of aircraft movement:

Runway
Taxiway
Intersection
Holding Position
Apron
Stand
Aircraft Position

At every stage: Marking + Signage + Lighting + Control + Operational Procedure must communicate a consistent message.

The whole airfield layout
TERMINALTOWERAPPRWYTWYSTDCCR HOUSELV DISTRIBUTIONAPRON FLOODLIGHTSWINDSOCK (LIT)LOCALISERLANDING DIRECTIONRUNWAYPARALLEL TAXIWAYAPPROACHLIGHTSAPRON123456789SERIES CIRCUITS FROM THE CCR HOUSE (APPROACH, RUNWAY, TAXIWAY, STAND GUIDANCE)LOW-VOLTAGE SUPPLY TO APRON FLOODLIGHTS (NOT A SERIES CIRCUIT)TYPICAL LAYOUT · CONCEPTUAL PLAN VIEW · NOT TO SCALE
Figure 19. Conceptual plan view of a typical airport lighting layout, with approach, runway and taxiway systems.
AGL Visual Encyclopedia: Complete AGL airport layout Runway and taxiway relationship
Standards & References

Standards & Reference Framework

Engineering should be based on the current applicable editions of the relevant standards. Exact colours, dimensions, character sizes, locations, spacing, lighting characteristics and acceptance criteria should always be taken from the applicable current requirement and approved airport design.

ICAO

Annex 14, Aerodromes, Volume I (visual aids: markings, lights, signs); Aerodrome Design Manual Doc 9157 Part 4; A-SMGCS Manual Doc 9830

FAA

Airport marking, sign-system and visual-aid installation standards (AC 150/5340 series) where relevant

DGCA

Applicable DGCA and Indian aerodrome requirements

Airport-Specific

National standards, technical specifications and approved aerodrome drawings and philosophy

Final Principle

The Integration Principle

A marking tells you where the route is. A sign tells you what the location or instruction means. Lighting makes the visual system usable under the required operating conditions. Control determines when controllable lighting systems operate. Monitoring tells the operator what the system reports. Procedures determine how the information is used operationally.

Together they create an integrated surface movement guidance system. Airfield markings and signage should never be designed as isolated civil or visual elements — they are part of the aerodrome's complete visual guidance architecture.

Final Workflow: Survey → Design → Mark → Sign → Illuminate → Integrate → Control → Monitor → Test → Verify → Maintain → Operate Safely
Test Your Knowledge

Quick Knowledge Check

Q1. Which combination best represents the typical integrated concept at a runway holding position?

A. Taxiway centreline lighting only
B. Holding position marking + stop bar + runway guard light + mandatory sign
C. Apron floodlight + VDGS
D. Direction sign only

Q2. A control screen shows a taxiway centreline light circuit as "ON". What does this confirm?

A. Control system indication only — not that the field element is visually performing correctly
B. That the marking is correctly aligned
C. That the sign colour is correct
D. That photometric verification is no longer required

Q3. A VDGS indicates STOP at a position different from the painted stand stop position. What is the best first step?

A. Repaint the marking immediately without further checks
B. Ignore the VDGS since markings take precedence
C. Check the approved stand drawing, VDGS coordinates and stand centreline as a configuration-control issue
D. Replace the VDGS hardware

Q4. Why should markings, signs and lighting always be reviewed together after a taxiway relocation?

A. Because only lighting needs to change
B. Because a change to one visual system can cascade into centreline, marking, sign, lighting and ALCMS configuration changes
C. Because signs are never affected by geometry changes
D. Because ALCMS configuration is unrelated to physical layout
Quick summary: three layers, one message
THREE LAYERS · ONE MESSAGEMARKINGSpaint on the pavementSIGNSbeside the pavementLIGHTSon and around itONE CONSISTENTMESSAGE TO THE PILOTwhere am I · where to · may I proceedFIVE THINGS MUST AGREE1COLOURsame meaning on all three2DESIGNATIONsame name and number3POSITIONwhere the pilot expects it4STATUSlit, unlit or switched as intended5RECORDSschedule matches the airfieldA CONFLICT IN ANY ONE LAYER IS A VISUAL GUIDANCE DEFECT, EVEN IF EACH LAYER IS CORRECT ON ITS OWN
Figure 20. Markings, signs and lights are three layers of one message, and five things must agree between them.
Explore More

Explore More AGL Engineering

SIGNAGE

Airfield Signage & Taxiway Guidance Signs

The information layer in detail — message, colour, electrical interface, illumination and control.

Open Airfield Signage →
PROTECTION

Runway Guard Lights & Stop Bars

The conspicuous warning layer at runway holding positions.

Open Stop Bars & RGL →
SYSTEM

Runway Incursion Prevention & SMGCS

How the full surface movement guidance and control system fits together.

Open SMGCS →
GUIDANCE

Taxiway Lighting Systems

Edge, centreline, lead-on/lead-off lighting and their electrical interface.

Open Taxiway Lighting →
CONTROL

ALCMS Deep Dive

Airfield lighting control and monitoring system architecture and integration.

Open ALCMS →
PERFORMANCE

AGL Photometry

Verify the optical performance of the installed visual guidance system.

Open AGL Photometry →
VISUAL AID

PAPI Engineering Guide

Another visual-guidance element coordinated with markings and signage.

Open PAPI Guide →
SYSTEMS

Runway Lighting Systems

The lit runway environment markings and signage complement.

Open Runway Lighting →
PROCESS

AGL Installation & Commissioning

Field installation of the integrated visual guidance system.

Open Installation & Commissioning →

Mark. Identify. Guide. Warn. Control. Verify.

From pavement paint to control-room screen — explore the complete AGL knowledge base for integrated airfield visual guidance engineering.

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AGL Engineering Hub

Explore the AGL Engineering Knowledge Hub

Fundamentals

All About AGL How Airfield Lighting Works Physics of AGL AGL Components Airfield Lighting Colour Codes LED Airfield Ground Lighting LED Benefits, Lifespan & Energy Savings Solar AGL (SAGL) Portable AGL (PAGL) Advantages & Disadvantages by System Type Sustainability in AGL

Standards & Compliance

ICAO Annex 14 AGL Requirements ICAO Aerodrome Lighting Requirements FAA AC 150/5340 Series EASA CS-ADR-DSN Compliance NOTAMs

Runway, Taxiway & Approach Lighting

Runway Lighting Systems Taxiway Lighting Systems Airport Approach Lighting Systems Approach Lighting Systems Apron Lighting & Stand Guidance Apron Floodlighting Design & Lux Levels VDGS: Visual Docking Guidance Obstruction Lighting & Marking Airfield Signage & Guidance Signs Markings & Signage Integration

Surface Movement & Safety

Follow the Greens Runway Guard Lights & Stop Bars Runway Incursion Prevention & SMGCS A-SMGCS ALCMS

PAPI

How Does PAPI Work? PAPI Engineering Guide ICAO PAPI Requirements PAPI Installation & Aiming PAPI Calibration & Alignment PAPI Alignment & Maintenance PAPI Maintenance Checklist

Electrical Engineering & Power

AGL Design & Electrical Engineering Diagrams, Schematics & Wiring CCR Working Principle CCR Deep Dive AGL Isolating Transformers Airport Isolating Transformer Junction Box & Transformer Housing Cables & Connector Engineering Electrical Architecture & Redundancy Emergency Backup Power Emergency Power & Lighting Systems Surge Protection & Lightning Mitigation Lightning & Surge Protection for Circuits

Photometry & Testing

AGL Photometry Photometric Testing Guide Photometric Testing Procedure Runway Lighting Photometry Taxiway Lighting Photometry AGL Testing & Inspection Installation & Commissioning Testing & Commissioning Guide

Maintenance, Inspection & Safety

Preventive & Corrective Maintenance Maintenance Schedule & Checklist Inspection, Maintenance & Audit Checklists How to Inspect & Replace Airfield Lights Common Failure Causes & Fixes Outage Response & Runway Closure Maintenance Work Safety: LOTO, Permits, PPE

Resources, Documentation & Careers

Datasheets, Catalogues & PDF Guides Project Documentation: ITP, As-Built, O&M Engineer & Technician Job Description / Salary
FAQ

Frequently Asked Questions

Q1Why are airfield markings and signage not independent elements?

A pilot or vehicle operator experiences markings, signs, lighting and control together as one system. They work with runway and taxiway lighting, runway guard lights, stop bars, stand guidance, ALCMS, SMGCS and A-SMGCS, ATC procedures and operator awareness. If one element is incorrectly positioned, poorly maintained or visually confusing, the effectiveness of the whole system can be reduced.

Q2What questions should the combined visual guidance system answer?

An aircraft or vehicle should always be able to answer: Where am I? Where am I going? What route should I follow? Where must I stop? What runway or taxiway am I approaching? What action is required? The engineering chain is markings, signs, lighting, guidance, control, recognition and safe movement.

Q3What are airfield markings?

Airfield markings are visual markings applied to pavement or other approved surfaces to give information and guidance to aircraft and ground vehicles. They can identify the runway, threshold, centreline, edge, touchdown zone, runway designation, taxiway, holding positions, apron, aircraft stands, vehicle movement areas and restricted or protected areas.

Q4What is the difference between markings and signs?

Markings are applied to the pavement or surface and mainly provide surface guidance, while signs are ground-mounted, fixed installations that provide information or instruction and are viewed ahead or from the cockpit. Markings need paint and surface maintenance; signs need structure, face and lighting maintenance. Signs complement markings but do not replace them.

Q5Are airfield markings self-illuminated?

No. Markings are not self-illuminated and rely on aircraft lights, apron or area lighting and reflective materials, supported by AGL. Signs may be internally or externally illuminated, depending on sign type and requirement.

Q6What are the main types of airfield signs?

Operationally they are mandatory, location, direction and information signs. In ICAO Annex 14 the formal grouping is two classes, mandatory instruction signs and information signs, with location, direction and destination signs all being types of information sign. Confirm the classification and colours against the current applicable standard and approved project design.

Q7What is the visual language of airfield guidance?

A well-designed aerodrome uses a consistent visual language built from colour, shape, character, position, lighting, flashing or steady state, and contrast, so a user can recognise the meaning of a visual element quickly.

Q8What runway markings does an engineer need to coordinate?

Runway designation, centreline, threshold, threshold markings, touchdown zone, runway edge, aiming point and displaced threshold, plus other approved operational information. Exact arrangements depend on runway category, configuration and applicable requirements.

Q9What taxiway and apron markings are involved?

Taxiway markings include the centreline, edge markings where required, holding-position and intermediate holding-position markings, intersection markings and apron transition markings. Apron markings include stand centreline, lead-in line, stop position, equipment limits, vehicle routes, safety areas and service areas, coordinated with aircraft stand geometry.

Q10What does a runway designation marking do?

It lets pilots identify the runway from its magnetic orientation. It must correspond with published aerodrome information, orientation, approved markings, signs, lighting and operational documentation, so changes require coordinated review.

Field Insight

Engineering & Expert Notes

RS
By Rahul Sharma
Airfield Ground Lighting Specialist
Markings, Signs and Lights Must Tell One Story
Integration

Inconsistent information between layers confuses crews. Review the whole visual guidance system together.

Check Visibility From the Cockpit
Visibility

Evaluate from the pilot's eye position in day, night and low visibility. A sign visible on the drawing may be obscured on site.

Contrast and Cleanliness Affect Meaning
Condition

Faded paint and dirty signs reduce recognition. Include condition checks in inspections.

Hold Positions Deserve Special Attention
Hold Points

Consistency among markings, signs and stop bars at holding positions is essential for incursion prevention.

Control Systems Should Reflect Layout Changes
Control

When taxiway layouts change, update lighting circuits, signs and control logic together.

Walk the Airfield After Changes
Verification

A drive-through at night after modifications often reveals mismatches the drawings do not.

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