It is a criminal offense to use or operate a motor vehicle, boat, airplane, motorcycle, or other motor-propelled vehicle without the consent of the owner or other person authorized to give consent. This crime is generally known as (1) unauthorized use of a motor vehicle, (2) unauthorized use of a vehicle, or (3) joyriding.

The difference between this crime and the crime of theft is that the state does not have to prove a person charged with unauthorized use of a motor vehicle intended to keep the vehicle or permanently deprive the owner of the vehicle.

Laws regarding the unauthorized use of a motor vehicle vary from state to state and are generally found in a state’s statutes—often in the penal or criminal code or the vehicle code.

In Maryland, unauthorized use of a motor vehicle, commonly referred to as 'joyriding,' is a criminal offense distinct from theft. Under Maryland law, specifically under Maryland Code, Criminal Law Section 7-203, a person may be charged with unauthorized use if they take or use a motor vehicle, boat, airplane, motorcycle, or other motor-propelled vehicle without the owner's consent. The key element of this crime is the lack of consent from the owner or the person authorized to give consent, rather than the intent to permanently deprive the owner of the vehicle, which is required for a theft charge. The penalties for unauthorized use of a motor vehicle in Maryland can include imprisonment and fines. It is important for individuals charged with this offense to consult with an attorney to understand their rights and the specific implications of the charge.