Car rentals are subject to many conditions which vary from one brand to another. The vehicle must be returned in a good condition and sometimes must not exceed a maximum driven distance, otherwise extra fees may be incurred. Additionally, some companies set a minimum age for the vehicle driver, which in some cases is as high as 25, even in countries where the minimum legal age to hold a driver's license is much lower. In all cases a valid, current driver's license is required in order to rent a vehicle.
Recent conditions have utilized GPS technology to limit maximum speeds [2] or driving to specific regions. Renewable fuel vehicles are available in certain areas.[3]
The vast majority of car rental companies require the use of a credit card to make it easier for them to trace a person should they attempt to steal a car, or to charge additional fees at will if a defect is later found with the car.
Source : Car rental
