Safe driving is the employee's responsibility to make sure the vehicle is safe to drive if it is not possible to comply with the laws, such as minimum tread is too low, a fire damaged.
Driving safety is the responsibility of the employee. To ensure that the vehicle is not safe to drive away if they can not comply with the minimum legal tread is too low, for example, fire damage.
Driving safety is the responsibility of the staff. To ensure the car will be safe there must not drive away if not complied with the minimum water, such as tires is too low, the fire damage.