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.
Public policy :
 In many jurisdictions it is compulsory to have vehicle insurance before using or keeping it on public roads. Most jurisdictions relate insurance to both the car and the driver, however the degree of each varies greatly.

 A 1994 study by Jeremy Jackson and Roger Blackman showed, consistent with the risk homeostasis theory, that increased accident costs caused large and significant reductions in accident frequencies.

Australia
 In South Australia, Third Party Personal insurance from the State Government Insurance Corporation (SGIC) is included in the licence registration fee.

 In Victoria, Third Party Personal insurance from the Transport Accident Commission is similarly included, through a levy, in the vehicle registration fee .

Canada
 Several Canadian provinces (British Columbia, Saskatchewan, Manitoba and Quebec) provide a public auto insurance system while in the rest of the country insurance is provided privately. Basic auto insurance is mandatory throughout Canada with each province's government determining which benefits are included as minimum required auto insurance coverage and which benefits are options available for those seeking additional coverage. Accident benefits coverage is mandatory everywhere except for Newfoundland and Labrador. All provinces in Canada have some form of no-fault insurance available to accident victims. The difference from province to province is the extent to which tort or no-fault is emphasized. Typically, coverage against loss of or damage to the driver's own vehicle is optional - one notable exception to this is in Saskatchewan, where SGI provides collision coverage (less than a $700 deductible, such as a collision damage waiver) as part of its basic insurance policy. In Saskatchewan, residents have the option to have their auto insurance through a tort system but less than 0.5% of the population have taken this option.

South Africa
 South Africa allocates a percentage of the money from petrol into the Road Accidents Fund, which goes towards compensating third parties in accidents.

United Kingdom
 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 The Road Traffic Act 1988, which was last modified in 1991. The act requires that some 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.

 Insurance which satisfies the requirement of the act, for those who require cover, is called third party insurance. It is an offence to drive your 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, heath 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 indeed 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.

 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 you are required to produce an insurance certificate when you purchase the disc. However it is a known practice for some people to purchase insurance to gain the certificate and then to cancel the insurance and gain a full refund within the statutory 14 day cooling off period.

 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.

United States
 In the United States, auto insurance is compulsory in most states, though enforcement of the requirement varies from state to state. The state of New Hampshire, for example, does not require motorists to carry liability insurance, while in Virginia residents must pay the state a $500 annual fee per vehicle if they choose not to buy liability insurance. Penalties for not purchasing auto insurance vary by state, but often involve a substantial fine, license and/or registration suspension or revocation, as well as possible jail time in some states. Usually, the minimum required by law is third party insurance to protect third parties against the financial consequences of loss, damage or injury caused by a vehicle.