Most states require you to maintain a minimum level of auto insurance before you can register your car or drive it on state roads. Typically all that is required is liability insurance that will cover property damage and injuries to other individuals if you are involved in an at-fault accident. Car insurance follows your car, so in most cases anyone who drives it is covered, even if they are not listed on your policy. But there are exceptions.
Two kinds of drivers are covered by your car insurance: those listed on your policy, and occasional drivers. Listed drivers are people who have regular access to your car, can be expected to drive the vehicle at least periodically, and are included as drivers on your policy. Listed drivers typically include yourself and members of your household who have a valid driver's license. Occasional drivers are people who are not members of your household and don't have regular access to your car. For example, suppose your 23 year-old daughter lives across town and occasionally visits. She does not have regular access to your car and is not listed as a driver on your insurance policy. She is an occasional driver and would probably be covered if she borrowed your car. If a family member who lives in your household is not listed on your policy, she might not be covered if she borrows your car.
Your car is usually covered by your insurance if the person who borrows it does so with your permission. That permission can be either written, verbal or implied, but it must exist. If someone borrows your car without your permission, that driver might not be insured. For example, if you give a friend permission to drive your car to the dentist for a checkup, he is covered. If your friend then drives your car out of state to see his girlfriend who is away at college, he might not be covered, since you did not give him permission to use your car for that purpose.
A non-listed person who drives your car is typically covered up to the limits of your policy. Your insurance serves as the primary policy. If that person is involved in a serious accident resulting in costs that exceed your policy, her insurance might cover the excess as a secondary policy.
You might be a perfect driver with no moving violations and no accidents on your record, but if you loan your car to a friend and she has an accident, it is reflected on your insurance policy. If you have a deductible, you are responsible for paying it. Your insurance rates might increase as a result of the accident, even though you were not personally involved in it. If your friend doesn't have insurance and the damages caused by the accident exceed the limits of your policy, you could be held personally liable for damages and medical costs.
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