The invention relates to a driver authorisation system (1) for means of transport. Said system comprises an on-board identification device (2) for communicating with a mobile release device (31) to verify the usage authorisation, in addition to an ignition lock (4) for an ignition key (3) and a control unit (5) for activating ignition lock functions, such as starting and switching off the motor, when the ignition key adopts a corresponding position in the ignition lock. The aim of the invention is to improve the aforementioned driver authorisation systems (1) in order to optimise the production of the driver authorisation devices (1). To achieve this, the ignition lock functions can be activated by means of the control unit (5), using a pushbutton (6) that can be mounted and actuated on and removed from said ignition lock (4).