In an apparatus in an authorization checking system for vehicles, comprising a checking unit (1, 3) which is adapted to check whether a driver's license, an operator card or a vehicle card (2), read by the checking unit (1, 3), is programmed in the checking unit (1, 3) as being authorized for driving the vehicle before start of the vehicle is enabled, the checking unit (1, 3) is programmable by means of radio signals.
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