A steering system for a vehicle, preferably a crop harvesting vehicle such as a sugar cane harvester, including a frame mounted to, or integral with, the vehicle and two wheel assemblies, each wheel assembly comprising a wheel rotatably mounted to a linkage, and a wheel actuator configured to turn the wheel relative to the linkage. The wheel assemblies are mounted to the frame via the linkage and at least one linkage actuator is configured to manoeuvre the linkages such that a distance between the wheels is varied.
