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Lighting of objects – Low-intensity obstacle lights on vehicles other than those associated with emergency or security shall be..
  • A
    fixed red.
  • B
    fixed blue.
  • C
    flashing yellow.
  • D
    flashing blue.

ICAO Annex 14
Chapter 6. Visual Aids for Denoting Obstacles

Table 6-1. Characteristics of obstacle lights

Light Type Colour Signal type/ (flash rate)
Low-intensity, Type A (fixed obstacle) Red Fixed
Low-intensity, Type B (fixed obstacle) Red Fixed
Low-intensity, Type C (mobile obstacle) Yellow/Blue (a) Flashing (60-90 fpm)
Low-intensity, Type D (follow-me vehicle) Yellow Flashing (60–90 fpm)
Low-intensity, Type E Red Flashing
Medium-intensity, Type A White Flashing (20–60 fpm)
Medium-intensity, Type B Red Flashing (20–60 fpm)
Medium-intensity, Type C Red Fixed
High-intensity, Type A White Flashing (40-60 fpm)
High-intensity, Type B White Flashing (40-60 fpm)

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