Before opting in, check to see if your regular car insurance covers you for temporary use of a rental. Most policies do, particularly if you’re renting in the U.S.
Otherwise, you may be covered by your credit card. Some cards, including all Chase and Citi cards provide global auto rental coverage and many cards cover common issues like theft, auto accidents and towing costs if your car rental breaks down.
In addition, all Visa and American Express cards provide a loss damage waiver with coverage of $50,000, or more, in some cases.
If you aren’t covered by your own car insurance or a credit card, you may also be able to buy a policy for less than the rental car company would charge.
InsureMyRentalCar.com, for example, offers a daily policy with coverage up to $100,000 for just $6 a day.
Source : CNBC