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An escort vehicle, also called a pilot vehicle in most areas, is an automobile used to alert other road users of an upcoming trucks with large loads, convoys of large vehicles or to guide motorists through construction sites. They are also used to guide aircraft taxiing from the runway to the apron at many airports. In most instances, pilot vehicles are provided by companies that specialize in convoy escort, although escort duties are occasionally performed by police vehicles (especially for parades and funeral processions or shipments that require a high level of security during transit).[1] Some escort companies have special authority for traffic control through state approval.[citation needed]