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 affect the expected cost of future claims. 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).
The insurance certificate or cover note issued by the insurance company constitutes the only legal evidence that the policy to which the certificate relates satisfies the requirements of the relevant law applicable in Great Britain, Northern Ireland, the Isle of Man, the Island of Guernsey, the Island of Jersey and the Island of Alderney. The Act states that an authorised person, such as a police officer, may require a driver to produce an insurance certificate for inspection. If the driver cannot show the document immediately on request, and evidence of insurance cannot be found by other means such as the MID, then the Police are empowered to seize the vehicle instantly.
Auto insurance is financial protection, and not just for the investment you made when you bought your car. After a really serious accident, bills for damage and injuries can easily reach into hundreds of thousands of dollars. If you happen to cause such a wreck, the victims could sue you. In the worst case scenario, assets such as your savings and home could be seized.