Call your insurance company prior to loaning your car to a friend or a family member to make sure that you coverage extends to them. Your policy may have coverage for short term loans.
You bet. And it works both ways. If you're borrowing someone's car, find out if they have insurance on the car. I just read a lawsuit against a man who borrowed a car, got into an accident that was mostly not his fault, and only found out after the accident that the car insurance had not been renewed 3 months earlier. As one of the drivers, he was found 20% responsible for the accident and ended up with a $30,000+ judgment against him.