Drive covers the control of wheeled or drawn vehicles, whether by one or more beasts of burden or more esoteric means: such as carts, carriages, chariots, or sleds. Drive rolls are needed when a character wants to do something out of the ordinary with a vehicle – traverse treacherous terrain, jump obstacles, and so on. A roll is also necessary if the vehicle being driven is drawn by different beasts than the driver is used to (horses instead of oxen, for example) or there are more, or fewer beasts teamed together to pull the vehicle.