The Collision Damage Waiver
The CDW is used to supplement the renters own full coverage insurance. It reduces or eliminates out of pocket expense for small occurences such as rock chips, minor scratches, minor dents or body damage.
If anything were to occur of a more severe nature, ie. an accident or collision, the renter's insurance would be the primary and Withnell would take care of items like the deductible.
The CDW is voided by any condition that would void the contract. Those terms can be found on the back of your rental contract.