In Norway, the vehicle owner must provide the minimum of liability insurance for his/her vehicle(s) – of any kind. Otherwise, the vehicle is illegal to use. If a person drives a vehicle belonging to someone else, and has an accident, the insurance will cover for damage done. Note that the policy carrier can choose to limit the coverage to only apply for family members or person over a certain age.
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.