Mr. Chris Davies:

Everyone is aware that a car's braking system is an important safety measure and that tyres need to have a proper thread. The windscreen, however, has passed through time without anyone being aware of how important it is not only to the vehicle's structural strength but also its safety. It is the same across the world. It is hard to know whether a windscreen has been fitted properly unless one cuts it out, but that is a destructive test.