While an “insured vehicle” may include a friend or neighbor’s vehicle or a rental car, if the vehicle was available for regular use, it might be excluded. A “replacement” vehicle will probably be covered, but in some cases only under circumstances where the insured’s vehicle cannot be operated for some specific reason, such as a repair. Coverage might not follow anyone if the insured is driving a vehicle other than a “private passenger vehicle not owned and listed on the insured’s policy.” There really is no such thing as a standard auto policy anymore and coverage for non-owned autos will be different under some policies and non-existent under others.
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.
There are certainly insurance carriers and policies that will not cover any driver not specifically named in the policy. Other relevant facts include where the “other driver” resides and if they are related to the insured. In general, if someone is living in the insured’s household and regularly drives the insured’s vehicle, many insurance carriers expect you to have that person named on the policy. They will need to undergo the same underwriting and qualification process as any other policyholder.