ICAO: Vehicle Signalling at Airports
Legislation, guidance and technical explanations – everything you need to know about professional vehicle signaling.
Vehicle signalling at airports refers to the complete set of visual warning devices (obstacle lighting and colour marking) mandated by ICAO Annex 14, Volume I. These requirements stipulate that vehicles operating on the manoeuvring area must be equipped with flashing lights (Type C for standard vehicles, Type D for Follow-Me vehicles) with an intensity between 40 cd and 200 cd and a flash frequency of 60–90 flashes per minute (fpm), complemented by specific colour coding (amber/blue) for immediate identification by pilots and ATC.
Classification of Obstacle Lighting: Type C vs. Type D
Compliance with ICAO standards is crucial for safety and for preventing runway incursions. Below are the technical specifications for airfield vehicles: classification of obstacle lighting (Type C vs. Type D). ICAO makes a clear distinction based on the function of the vehicle. In practice, this means that standard ECE R65 lighting is often insufficient without specific adjustment:
Feature | Type C (standard vehicles) | Type D (Follow-Me vehicles) |
Function | Maintenance, baggage, refuelling trucks | Guiding aircraft |
Light intensity | Minimum 40 candela (cd) | Minimum 200 candela (cd) |
Flash frequency | 60–90 fpm (mandatory) | 60–90 fpm (mandatory) |
Colour | Yellow/Amber or Blue (emergency services) | Yellow/Amber |
Why this difference is important
Follow-Me vehicles (Type D) operate directly in front of aircraft. Pilots are positioned high in the cockpit and must be able to clearly distinguish the vehicle, even in bright sunlight or poor visibility. Therefore, ICAO requires a significantly higher light intensity (minimum 200 cd).
Standard service vehicles (Type C) have a lower minimum intensity of 40 cd, but must still remain clearly visible throughout the entire manoeuvring area.
Mandatory Flash Frequency: 60–90 FPM
ICAO prescribes a flash frequency between 60 and 90 flashes per minute (fpm).
This range is not chosen arbitrarily:
- Too low a frequency → insufficient attention value
- Too high a frequency → risk of glare and confusion
- Correct range → optimal recognition without disorientation
Many standard ECE R65 beacons do not automatically comply with this requirement. ICAO compliance requires explicit verification of frequency settings.
Colour Coding and Identification at the Airport
Blue (flashing)
The choice of blue is based on the need for immediate recognition and priority. At a busy airport, emergency services must be directly identifiable to both pilots and air traffic control (ATC).
Yellow/Amber (flashing)
Yellow is the universal colour for obstacle warning. The human eye is highly sensitive to this colour during daytime, and at night it provides strong contrast without impairing pilots’ night vision (as white light would).
Red (steady)
Within the ICAO context, a steady red light (Type A) is used to mark objects that constitute a potential obstacle but do not manoeuvre freely across the airfield.
Best Practices for ICAO Vehicle Signalling
Check the flash frequency (60–90 fpm)
Verify that the electronics are specifically configured to ICAO standards. Many standard ECE R65 beacons deviate from this range, which can lead to rejection during inspections.
Differentiate between Type C and Type D
Use Type C (minimum 40 cd) for standard service vehicles. For Follow-Me vehicles, Type D (minimum 200 cd) is mandatory to guarantee visibility from a high cockpit position.
Take vertical light distribution into account
Ensure installation provides optimal light output between +2° and +10° vertically. This technical detail is crucial for pilots approaching the vehicle at close range.
Do not rely blindly on ECE R65 certification
An ECE R65 certificate covers public road use but does not guarantee ICAO compliance. Always verify specific ICAO test reports regarding frequency and luminous intensity.
Do not use blue for non-emergency vehicles
ICAO Annex 14 strictly restricts blue light to emergency and security vehicles. Regular services must use Amber (Yellow) exclusively.
Do not underestimate the impact of mounting height
The signalling must be visible 360 degrees to both ground personnel and air traffic control (ATC). Ensure that vehicle superstructures do not block the light output.