In general, insurance coverage for an insured driving someone else’s vehicle is the coverage he carries for his own vehicle. The driver’s personal coverage will apply in most cases when driving a vehicle he does not own. This includes any uninsured motorist coverage he carries and the medical portions of his policy. The driver’s property damage coverage might carry over while driving another’s car as well, depending on the policy language, the respective limits of the two policies involved, and the facts. If a person drives his own vehicle without insurance, he should not expect that he is covered when driving someone else’s vehicle.
Liability insurance coverage on a personal auto policy follows the driver no matter whose vehicle is being operated, provided it is an eligible vehicle. All states, except for one (New Hampshire), require at least liability coverage. Liability coverage protects the insured (i.e., follows the driver) when the insured operates a vehicle owned by someone else. In such a situation, they will still usually be covered under their own auto insurance policy. However, the best rule of thumb in looking for coverage under a policy is to begin with the exclusions.