All rental vehicles already include the basic vehicle assistance, which covers mechanical defects only. However, at the time you pick up the rental vehicle, the counter agent may offer you an additional service called Roadside Service, sometimes reffered to Premium Roadside Assistance. This optional service is available in the US and Canada for an additional cost of U$ 7 to U$ 9, depending on the rental car company, and will extend the basic vehicle assistance coverage to include assistance in cases of problems that are not related to mechanical defects. The additional services covered include: Key replacement (including remote access keys), towing services when necessary, tire repair and replacement, jump start with a battery boost to start vehicle, locksmith service to open vehicle when keys are accidentally locked inside the vehicle and, fuel delivery of up to 3 gallons. This optional service may be purchased at the rental counter at the time the vehicle is being picked-up.