Some insurance companies will provide a basic vehicle for you to use whilst your vehicle is being repaired. If your vehicle is critical to your work, this option can be invaluable. The cost of the courtesy car will usually be reflected in the cost of the policy.
A courtesy car, also called a crew car, is a car provided by an FBO to transient pilots for a fairly short time free of charge or at a nominal charge. This is to run short errands or grab a quick meal. It's a great service.
an optional extra for comprehensive cover