Runway Lights Explained: Colors, Spacing, and Types

Runway lights help pilots identify and use the runway at night and in reduced visibility. During the day, paint and pavement markings do much of the work. At night, lights become the visual language of the airport.

For student pilots, runway lighting is not just something to memorize for the written test. It is something you use on takeoff, landing, taxi, and go-around decisions.

This guide fits with runway numbers, runway markings, and runway signs.

Runway Edge Lights

Runway edge lights outline the usable runway. They are normally white, but on instrument runways they may change to yellow near the far end of the runway to warn that runway remaining is getting short.

The end of the runway is marked with red lights when viewed from the runway direction. If you see red lights ahead during landing or takeoff, your available runway is nearly gone.

Edge lights may be low, medium, or high intensity depending on the airport and runway. Larger or instrument runways often have brighter systems.

Threshold Lights

Threshold lights identify the beginning of the landing portion of the runway. When you approach a runway, the threshold lights are green.

This matters if a runway has a displaced threshold. The pavement may begin earlier, but the threshold lights show where landing distance begins.

From the opposite direction, those same lights may appear red to mark the runway end.

Centerline Lights

Runway centerline lights are common on precision runways and larger airport runways. They help pilots maintain alignment during takeoff and landing.

Centerline lights are white for most of the runway. Near the far end, they begin alternating red and white, then become all red for the final portion. This warns the pilot that runway remaining is decreasing quickly.

At night, this can be a strong cue during landing. If the centerline lights are turning red and white while you are still floating, a go-around may be the better choice.

Touchdown Zone Lights

Touchdown zone lights are rows of white light bars near the beginning of some precision runways. They help pilots identify the intended touchdown area.

They are especially useful in low visibility because they reinforce the runway aim point and help with depth perception.

If you land far beyond the touchdown zone, stopping distance becomes a real concern. Lights can help you recognize that problem early.

REILs

Runway End Identifier Lights, or REILs, are synchronized flashing lights near the runway threshold. They help pilots quickly identify the approach end of the runway.

REILs are useful when the runway blends into city lights, terrain, snow, or other visual clutter. They are also helpful at airports with fewer approach lighting features.

Approach Lighting Systems

Approach lighting systems extend outward from the runway threshold and help pilots transition from instrument flight to visual landing.

There are several types, but the purpose is similar: guide your eyes toward the runway environment. In poor visibility, approach lights may appear before the runway itself.

Instrument pilots must know what visual references allow descent below minimums and how far they may continue based on what they see.

VASI and PAPI

VASI and PAPI systems give visual glide path information.

A basic VASI uses red and white light bars. The common memory aid is: white over white, high; red over white, on glide path; red over red, low.

A PAPI usually has a row of four lights. Two white and two red means you are on the glide path. More white means high. More red means low.

These systems provide vertical guidance only. They do not tell you whether you are left or right of the runway centerline.

Taxiway Lighting

Do not confuse runway and taxiway lights. Taxiway edge lights are blue. Taxiway centerline lights, when installed, are green. Lead-on and lead-off lights may use alternating colors near runway transitions.

At night, color discipline helps prevent runway incursions. If you are unsure where you are, stop the aircraft and ask for help.

If airport surface movement still feels busy, review airport diagrams and runway incursion prevention before your next night flight.

Student-Pilot Takeaway

Runway lights tell a story: where the runway begins, where the edges are, where the centerline is, how much runway remains, and whether your descent path looks right.

Learn the colors, then connect them to decisions. Lights are not decoration. They are cues for alignment, landing distance, runway awareness, and go-around judgment.

Official References

• FAA AIM Chapter 2 - Aeronautical Lighting and Airport Visual Aids
• FAA Aeronautical Information Manual
• 14 CFR Part 91 General Operating Rules
• FAA Aeronautical Chart User's Guide