Your windshield is actually two sheets of glass, held together by an inner layer of polyvinyl butyrate, supporting up to 70% of the vehicle’s weight in a rollover accident. Stone chips and cracks severely compromise the structure of the windshield, posing a serious safety risk in the event of an accident. Most vehicle manufacturers recommend replacing the windshield when a chip or crack appears in a line of sight; particularly with high technology vehicles that use accident avoidance technology.