How does taxiway intersection lighting work?

At a taxiway intersection, several independent lighting systems layer on top of one another — edge lights outline the pavement shape, centreline lights curve through with reduced spacing, and holding-position lighting appears wherever the intersection requires a stop or extra caution.

TAXIWAY / TAXIWAY INTERSECTION DIRECTION OF TAXI CLEARANCE BAR 3 FIXTURES · YELLOW ACROSS CENTRELINE SITED AT SUFFICIENT DISTANCE FROM THE INTERSECTION EDGE LIGHTS TRACE THE CORNER RADIUS CENTRELINE CURVES THROUGH TIGHT CURVE · 7.5 M SPACING SCHEMATIC VIEW OF A TAXIWAY/TAXIWAY INTERSECTION · FIXTURE COUNT, CURVE RADIUS, AND SPACING ILLUSTRATIVE · NOT TO SCALE AIRCRAFT FOLLOWS THE CURVED CENTRELINE TRAFFIC ON THE OTHER ARM HOLDS SHORT OF THE CLEARANCE BAR
taxiway centreline (curved through)
taxiway edge lights (traces corners)
clearance bar (sited before the intersection)
The Fact ICAO Annex 14

A taxiway intersection is not lit by a single dedicated fixture type — it is the point where several independent AGL systems overlap, each doing its own job at the same patch of pavement. Taxiway edge lights trace the full outline of the paved surface, including around the corner radius where one taxiway meets another, so the usable pavement shape stays visible at night or in low visibility exactly as it does on a straight section.

Taxiway centreline lights do not stop at the intersection — they curve smoothly through it, following the intended taxi path rather than jumping straight across, and their spacing is reduced on the curve to keep the guidance dense enough for a pilot to track the bend accurately. ICAO Annex 14 gives a spacing of up to 30 m on straight sections (15 m where the runway visual range is below 350 m). On a curve the spacing depends on the radius: 7.5 m under 400 m radius, 15 m for 401 to 899 m and 30 m from 900 m, with the 7.5 m spacing extended 60 m before and after the tightest curves on taxiways used in RVR below 350 m. Where the intersection is complex enough to cause route confusion, or where ATC needs traffic to hold at a specific point within it, a clearance bar or intermediate holding-position lights are added on top of this base layer — they mark a location, they don't replace the centreline or edge lighting already guiding the aircraft through.

Taxiway Edge Lights
Outline the full pavement shape, including the corner radius where taxiways meet, where the layout needs them. Shielded at an intersection, exit or curve so they cannot be confused with other lights. Blue, elevated or inset.
Taxiway Centreline Lights
Curve through the intersection along the intended taxi path, with reduced spacing on the bend. Green, normally inset.
Clearance Bars & Intermediate Holding-Position Lights
Added on top of the base layer to flag conspicuity or a required hold. A clearance bar is sited at sufficient distance from the intersection itself, not inside the junction — see Entry 12 and Entry 13. Yellow, in-pavement.
Centreline spacing, straight 30 m max (15 m where RVR < 350 m)
Centreline spacing, curve 7.5 / 15 / 30 m by radius (<400 / 401–899 / ≥900 m)
Edge light corners Traced around the fillet radius
Reference ICAO Annex 14 · EASA CS-ADR-DSN · FAA AC 150/5340-30
Diagram is a schematic view of a taxiway/taxiway intersection — fixture count, curve radius, and spacing are illustrative, not a literal fixture layout. Spacing figures per ICAO Annex 14, Vol I, §5.3.17 (clause numbers differ between editions, so confirm against the edition in force); corner-fillet edge-light practice per FAA AC 150/5340-30.
Entry 7 · Lead-off lighting Entry 9 · Rapid-exit taxiway lighting

Frequently Asked Questions

Q1How does taxiway intersection lighting work?

Several independent lighting systems layer on top of one another at an intersection: edge lights outline the pavement shape, centreline lights curve through with reduced spacing, and holding-position lighting is added wherever the intersection requires a stop or extra caution.

Q2Do taxiway edge lights change at an intersection?

Where edge lights are provided they trace the full outline of the paved surface, including the corner radius where one taxiway meets another, keeping the usable pavement shape visible exactly as on a straight section. At an intersection, exit or curve they are shielded as far as practicable so that they cannot be confused with other lights.

Q3Does centreline light spacing change through an intersection?

Yes. ICAO Annex 14 gives up to 30 m on straight sections (15 m where RVR is below 350 m). On a curve the spacing depends on the radius: 7.5 m under 400 m radius, 15 m for 401 to 899 m and 30 m from 900 m, with the 7.5 m spacing extended 60 m before and after the tightest curves on taxiways used in RVR below 350 m.

Q4When are clearance bars or holding-position lights added at an intersection?

Where the intersection is complex enough to cause route confusion, or where ATC needs traffic to hold at a specific point, added on top of the base edge and centreline lighting rather than replacing it.

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