When your car insurance policy expires, you are no longer insured. This means that if you get into an accident, you will be responsible for the damages. If you are at fault, you could be sued. If you have collision coverage, your insurance company will pay for the damages to your car. If you have liability coverage, your insurance company will pay for the damages to the other car. If you have both, your insurance company will pay for the damages to both cars. If you have neither, you will be responsible for the damages to both cars.