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 theRoad 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 exampleRoad 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.

Excess

An excess payment, also known as a deductible, is the fixed contribution you must pay each time your car is repaired through your car insurance policy. Normally the payment is made directly to the accident repair “garage” (the term “garage” refers to an establishment where vehicles are serviced and repaired) when you collect the car. If one’s car is declared to be a “write off” or “total loss”(“write off” is commonly used in motor insurance to describe a vehicle the worth of which is less than the cost of repair), the insurance company will deduct the excess agreed on the policy from the settlement payment it makes to you.

If the accident was the other driver’s fault, and this is accepted by the third party’s insurer, you’ll be able to reclaim your excess payment from the other person’s insurance company.

Compulsory excess

A compulsory excess is the minimum excess payment your insurer will accept on your insurance policy. Minimum excesses vary according to your personal details, driving record and insurance company.

Voluntary excess

To reduce your insurance premium, you may offer to pay a higher excess than the compulsory excess demanded by your insurance company. Your voluntary excess is the extra amount over and above the compulsory excess that you agree to pay in the event of a claim on the policy. As a bigger excess reduces the financial risk carried by your insurer, your insurer is able to offer you a significantly lower premium.

Basis of premium charges

Main article: auto insurance risk selection

Depending on the jurisdiction, the insurance premium can be either mandated by the government or determined by the insurance company in accordance to a framework of regulations set by the government. Often, the insurer will have more freedom to set the price on physical damage coverages than on mandatory liability coverages.

When the premium is not mandated by the government, it is usually derived from the calculations of an actuary based on statistical data. The premium can vary depending on many factors that are believed to have an impact on the expected cost of future claims.[10] Those factors can include the car characteristics, the coverage selected (deductible, limit, covered perils), the profile of the driver (age, gender, driving history) and the usage of the car (commute to work or not, predicted annual distance driven).

Gender

Men average more miles driven per year than women do, and consequently have a proportionally higher accident involvement at all ages. Insurance companies cite women’s lower accident involvement in keeping the youth surcharge lower for young women drivers than for their male counterparts, but adult rates are generally unisex. Reference to the lower rate for young women as “the women’s discount” has caused confusion that was evident in news reports on a recently defeated EC proposal to make it illegal to consider gender in assessing insurance premiums. Ending the discount would have made no difference to most women’s premiums.

Age

Teenage drivers who have no driving record will have higher car insurance premiums. However, young drivers are often offered discounts if they undertake further driver training on recognized courses, such as the Pass Plus scheme in the UK. In the U.S. many insurers offer a good grade discount to students with a good academic record and resident student discounts to those who live away from home. Generally insurance premiums tend to become lower at the age of 25. Some insurance companies offer “stand alone” car insurance policies specifically for teenagers with lower premiums. By placing restrictions on teenagers’ driving (forbidding driving after dark or giving rides to other teens, for example) these companies effectively reduce their risk. Senior drivers are often eligible for retirement discounts reflecting lower average miles driven by this age group.

Driving History

In most states, moving violations, including running red lights and speeding, assess points on a driver’s driving record. Since more points indicate an increased risk of future violations, insurance companies periodically review drivers’ records, and may raise premiums accordingly. Laws vary from state to state, but most insurers allow one moving violation every three to five years before increasing premiums. Accidents affect insurance premiums similarly. Depending on the severity of the accident and the number of points assessed, rates can increase by as much as twenty to thirty percent.

Marital status

Policy owners that are married often receive lower premiums than single persons. One reason is that marriage may be considered an indicator of stronger financial stability within the household.

Vehicle classification

Two of the most important factors that go into determining the underwriting risk on motorized vehicles are performance capability and retail cost. The most commonly available providers of auto insurance have underwriting restrictions against vehicles that are either designed to be capable of higher speeds and performance levels, or vehicles that retail above a certain dollar amount. Vehicles that are commonly considered luxury automobiles usually carry more expensive physical damage premiums because they are more expensive to replace. Vehicles that can be classified as high performance autos will carry higher premiums generally because there is greater opportunity for risky driving behavior. Motorcycle insurance may carry lower property damage premiums because the risk of damage to other vehicles is minimal, yet higher liability or personal injury premiums because motorcycle riders face different physical risks while on the road. Risk classification on automobiles also takes into account statistical analysis of reported theft, accidents, and mechanical malfunction on every given year, make, and model of auto.

Distance

Some car insurance plans do not differentiate in regard to how much the car is used. However, methods of differentiation would include:

Reasonable estimation

Another important factor in determining car insurance premiums involves the annual mileage put on the vehicle, and for what reason. Driving to and from work every day at a specified distance, especially in urban areas where common traffic routes are known, presents different risks than how a retiree who does not work any longer may use their vehicle. Common practice has been that this information was provided solely by the insured person, but some insurance providers have started to collect regular odometer readings in order to verify the risk.

Odometer-based systems

Cents Per Mile Now(1986) advocates classified odometer-mile rates. After the company’s risk factors have been applied and the customer has accepted the per-mile rate offered, customers buy prepaid miles of insurance protection as needed, like buying gallons of gasoline. Insurance automatically ends when the odometer limit (recorded on the car’s insurance ID card) is reached unless more miles are bought. Customers keep track of miles on their own odometer to know when to buy more. The company does no after-the-fact billing of the customer, and the customer doesn’t have to estimate a “future annual mileage” figure for the company to obtain a discount. In the event of a traffic stop, an officer could easily verify that the insurance is current by comparing the figure on the insurance card to that on the odometer.

Critics point out the possibility of cheating the system by odometer tampering. Although the newer electronic odometers are difficult to roll back, they can still be defeated by disconnecting the odometer wires and reconnecting them later. However, as the Cents Per Mile Now website points out:

As a practical matter, resetting odometers requires equipment plus expertise that makes stealing insurance risky and uneconomical. For example, to steal 20,000 miles (32,000 km) of continuous protection while paying for only the 2,000 miles (3,200 km) from 35,000 miles (56,000 km) to 37,000 miles (60,000 km) on the odometer, the resetting would have to be done at least nine times to keep the odometer reading within the narrow 2,000-mile (3,200 km) covered range. There are also powerful legal deterrents to this way of stealing insurance protection. Odometers have always served as the measuring device for resale value, rental and leasing charges, warranty limits, mechanical breakdown insurance, and cents-per-mile tax deductions or reimbursements for business or government travel. Odometer tampering—detected during claim processing—voids the insurance and, under decades-old state and federal law, is punishable by heavy fines and jail.

Under the cents-per-mile system, rewards for driving less are delivered automatically without need for administratively cumbersome and costly GPS technology. Uniform per-mile exposure measurement for the first time provides the basis for statistically valid rate classes. Insurer premium income automatically keeps pace with increases or decreases in driving activity, cutting back on resulting insurer demand for rate increases and preventing today’s windfalls to insurers when decreased driving activity lowers costs but not premiums.

GPS-based system

In 1998, Progressive Insurance started a pilot program in Texas in which drivers received a discount for installing a GPS-based device that tracked their driving behavior and reported the results via cellular phone to the company.[16] Policyholders were reportedly more upset about having to pay for the expensive device than they were over privacy concerns.[17] The program was discontinued in 2000.

OBDII-based system

In 2008, The Progressive Corporation launched MyRate to give drivers a customized insurance rate based on how, how much, and when their car is driven. MyRate is currently available inAlabama, Kentucky, Louisiana, Michigan, Minnesota, Maryland, New Jersey, Oregon and Texas. Driving data is transmitted to the company using an on-board telematic device. The device connects to a car’s OnBoard Diagnostic (OBD-II) port (all automobiles built after 1996 have an OBD-II.) and transmits speed, time of day and number of miles the car is driven. There is no GPS in the MyRate device, so no location information is collected. Cars that are driven less often, in less risky ways and at less risky times of day can receive large discounts. Progressive has received patents on its methods and systems of implementing usage-based insurance and has licensed these methods and systems to other companies. Progressive has service marks pending on the terms Pay As You Drive and Pay How You Drive.