The procedure applies to heavy vehicles weighing more than 11800kg (26 000lb) and particularly to those vehicles having two or more articulation joints that allow rotation in a horizontal plane. The procedure pertains to the lateral directional response of multi-articulated vehicles in avoidance maneuvers performed at highway speeds without braking.

Purpose- This test procedure is intended to be used for determining the rearward amplification and dynamic off tracking qualities of multi-trailer commercial vehicles (heavy trucks and buses).

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