What document must all drivers carry while operating a vehicle?

All drivers are required to carry a valid driver's license or permit while operating a vehicle because it serves as essential proof of authorization to drive. This documentation demonstrates that the driver has met the necessary requirements, such as passing tests and adhering to regulations imposed by the Department of Motor Vehicles. Operating a vehicle without this document can result in legal penalties, including fines or other consequences for unlicensed driving.

Having a vehicle owner's manual is helpful for understanding the features and maintenance of the vehicle, but it is not a requirement for driving. A traffic ticket is a legal notice issued for violations of traffic laws, and carrying one does not provide proof of a driver's ability or permission to operate a vehicle. Similarly, a point-of-sale receipt is usually associated with purchases and has no relevance to driving qualifications or permissions. Therefore, the primary document needed for legal operation of a vehicle is the valid driver's license or permit.