Vehicle insurance (also known as auto insurance, car insurance, or motor insurance) is insurance purchased for cars, trucks, and other vehicles. Its primary use is to provide protection against losses incurred as a result of traffic accidents and against liability that could be incurred in an accident.

In 1930, the UK government introduced a law that required every person who used a vehicle on the road to have at least third party personal injury insurance. Today UK law is defined by the Road Traffic Act 1988, which was last modified in 1991. The Act requires that motorists either be insured, have a security, or have made a specified deposit (£500,000 as of 1991) with the Accountant General of the Supreme Court, against their liability for injuries to others (including passengers) and for damage to other persons' property resulting from use of a vehicle on a public road or in other public places.

The minimum level of insurance cover commonly available and which satisfies the requirement of the Act is called third party only insurance. The level of cover provided by Third party only insurance is basic but does exceed the requirements of the act.

Road Traffic Act Only Insurance is not the same as Third Party Only Insurance and is not often sold. It provides the very minimum cover to satisfy the requirements of the Act. For example Road Traffic Act Only Insurance has a limit of £1,000,000 for damage to third party property - third party only insurance typically has a greater limit for third party property damage.

It is an offence to drive a car, or allow others to drive it, without at least third party insurance whilst on the public highway (or public place Section 143(1)(a) RTA 1988 as amended 1991); however, no such legislation applies on private land.

Vehicles which are exempted by the act, from the requirement to be covered, include those owned by certain councils and local authorities, national park authorities, education authorities, police authorities, fire authorities, health service bodies and security services.

The insurance certificate or cover note issued by the insurance company constitutes legal evidence that the vehicle specified on the document is insured. The law says that an authorised person, such as the police, may require a driver to produce an insurance certificate for inspection. If the driver cannot show the document immediately on request, then the driver will usually be issued a HORT/1 with seven days, as of midnight of the date of issue, to take a valid insurance certificate (and usually other driving documents as well) to a police station of the driver's choice. Failure to produce an insurance certificate is an offence. The HORT/1 is commonly known - even by the issuing authorities when dealing with the public - as a "Producer".

Insurance is more expensive in Northern Ireland than in other parts of the UK.

Most motorists in the UK are required to prominently display a vehicle licence (tax disc) on their vehicle when it is kept or driven on public roads. This helps to ensure that most people have adequate insurance on their vehicles because an insurance certificate must be produced when a disc is purchased.

The Motor Insurers Bureau compensates the victims of road accidents caused by uninsured and untraced motorists. It also operates the Motor Insurance Database, which contains details of every insured vehicle in the country.