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.
Collision insurance is a coverage that helps pay to repair or replace your car if it's damaged in an accident with another vehicle or object, such as a fence or a tree. If you're leasing or financing your car, collision coverage is typically required by the lender. If your car is paid off, collision is an optional coverage on your car insurance policy.