Motor vehicle theft (sometimes referred to as grand theft auto by the media and police departments in the US) is the criminal act of stealing or attempting to steal a motor vehicle (such as an automobile, truck, bus, coach, motorcycle, snowmobile, trailer). Nationwide in the US in 2005, there were an estimated 1.2 million motor vehicle thefts, or approximately 416.7 motor vehicles stolen for every 100,000 inhabitants. Property losses due to motor vehicle theft in 2005 were estimated at $7.6 billion. Since then the number of motor thefts nationally has declined. The most recent statistics, for 2009, show an estimated 794,616 thefts of motor vehicles nationwide, representing property losses of nearly $5.2 billion.

Some methods used by criminals to steal motor vehicles include:

The makes and models of vehicles most frequently stolen vary by several factors, including region and ease of theft.

In recent years in the United States, some models often on lists of most frequently stolen vehicles include Toyota Camry (best-selling car in USA), Honda Civic, Honda Accord, Acura Integra, Jeep Cherokee^{[disambiguation needed ]}, and Cadillac Escalade.^{[citation needed]}

A motor vehicle or road vehicle is a self-propelled wheeled vehicle that does not operate on rails, such as trains or trolleys. The vehicle propulsion is provided by an engine or motor, usually by an internal combustion engine, or an electric motor, or some combination of the two, such as hybrid electric vehicles and plug-in hybrids. For legal purposes motor vehicles are often identified within a number of vehicle classes including automobiles or cars, buses, motorcycles, motorized bicycles, off highway vehicles, light trucks or light duty trucks, and trucks or lorries. These classifications vary according to the legal codes of each country. ISO 3833:1977 is the standard for road vehicles types, terms and definitions.

As of 2010 there were more than one billion motor vehicles in use in the world excluding off-road vehicles and heavy construction equipment. Global vehicle ownership per capita in 2010 was 148 vehicles in operation per 1000 people. The United States has the largest fleet of motor vehicles in the world, with 239.8 million by 2010. Vehicle ownership per capita in the U.S. is also the highest in the world with 769 vehicles in operation per 1000 people. The People's Republic of China has the second largest fleet in the world, with slightly more than 78 million vehicles and since 2009 became the world's largest new car market. In 2011, a total of 80 million cars and commercial vehicles were built, led by China, with 18.4 million motor vehicles manufactured.

A police officer (also known as a policeman or policewoman, and constable in some forces, particularly in the United Kingdom and other Commonwealth nations) is a warranted employee of a police force. In the United States, "officer" is the formal name of the lowest police rank; in many other countries "officer" is a generic term not specifying a particular rank, and the lowest rank is often "constable". Police officers are generally charged with the apprehension of criminals and the prevention and detection of crime, and the maintenance of public order. Police officers may be sworn to an oath, and have the power to arrest people and detain them for a limited time, along with other duties and powers.

Some police officers may also be trained in special duties, such as counter-terrorism, surveillance, child protection, VIP protection, and investigation techniques into major crime, including fraud, rape, murder and drug trafficking.

Responsibilities of a police officer are varied, and may differ greatly from within one political context to another. Typical duties relate to keeping the peace, law enforcement, protection of people and property, and the investigation of crimes. Officers are expected to respond to a variety of situations that may arise while they are on duty. Rules and guidelines dictate how an officer should behave within the community, and in many contexts restrictions are placed on what the uniformed officer wears. In some countries, rules and procedures dictate that a police officer is obliged to intervene in a criminal incident, even if they are off-duty. Police officers in nearly all countries retain their lawful powers, while off duty.