In many modern cars, side curtain airbags rely on the windows to deploy correctly. The window acts as a backstop for the airbag to push against to cushion passengers. If the window is shattered, the airbag may deploy uselessly outside the vehicle, leaving you without that critical protection.
Modern vehicles rely on glass for structural support. The rear window (along with the windshield) adds rigidity to the car’s frame. In the event of a rollover accident, a missing rear window compromises the roof's ability to stay intact, significantly increasing the risk of injury. can i drive with a shattered back window