Final answer:
A driver fitness check involves evaluations of a driver's physical and mental ability to operate a vehicle safely, but does not include checks on the vehicle's mechanical fitness.
Step-by-step explanation:
A driver fitness check is a series of assessments to ensure that a driver is capable of safely operating a vehicle. This check typically includes tests for adequate vision, hearing, and physical ability to control the vehicle. Additionally, it may involve an evaluation of the driver's mental well-being and absence of any substances that could impair their ability to drive. However, a driver fitness check does not normally include an assessment of the vehicle's mechanical fitness, which is a separate procedure.