 The unit is manned by a small group of traffic officers, trained in Road Collision Investigation, Traffic Law Enforcement are experienced in dealing with collisions and incidents involving vehicles around the airport.They also work alongside the Air Accidents Investigation Branch (AAIB) of the Department for Transport where a vehicle may have been involved in an aircraft collision.The officers can be distinguished from their armed colleagues as they wear white caps, high visibility jackets and drive conventionally motorway marked battenburg liveried vehicles and are unarmed.