Races are started in one of two ways, either from behind a mobile barrier, using a mobile start or behind tapes from a standing start. The mobile barrier is usually a car or ute with two long arms, behind which the horses line up before moving to the starting line. The barrier may cover the entire track and in some cases the mobile can be ten horses wide. When the wings of the gate swing back, the starting vehicle speeds off, thus releasing the horses. This is the most common method of starting pacers and trotters in Australia.