Aftermarket glass is made by auto glass companies that don’t necessarily have contracts with specific automakers. Because of this, these third-party manufacturers may not abide by specific manufacturer guidelines. If fact, due to copyright laws, aftermarket manufacturers are prohibited from producing windshields that are identical to the factory-installed versions. So while the size and shape of the windshield may match, the safety technologies, durability, and thickness of the glass will likely be different, which may cause the collision avoidance systems, occupant safety systems not to work properly, and the only time to find this out may be at the time of an accident, by then injury or death may occur due to these features not working properly or not at all.