A controller for a motorised vehicle having at least a left wheel and a right wheel is provided, where the left wheel and the right wheel are driven independently by a motor arrangement. The controller is arranged to receive control signals from a user input device of the motorised vehicle, the control signals determining a requested left: wheel velocity and a requested right wheel velocity. A requested speed of the motorised vehicle is given by a mean of the requested left wheel velocity and the requested right wheel velocity and a requested spin of the motorised vehicle is given by a mean difference of the requested left wheel velocity and the requested right wheel velocity. A scaling unit determines a scaling factor in dependence on the requested speed and the requested spin and scales both the requested speed and the requested spin by the scaling factor to generate a target speed and a target spin. The controller is configured to convert the target speed and the target spin into a target left wheel velocity and a target right wheel velocity and the motor arrangement is responsive to the controller to drive the left wheel at the target left wheel velocity and to drive the right wheel at the target right wheel velocity.
