Airbag Performance
As a part of vehicle structure, the windshield is a critical to proper airbag deployment. In a crash, an improperly installed windshield may cause an airbag to deploy too early or too late. In either case, the safety of the occupants may be greatly compromised. On impact the windshield acts as a brace to support the passenger side airbag. If the windshield separates, the airbag does not have a constrained space, and it is not effective in protecting the occupants of the vehicle.
Structural Integrity
The windshield is an important part of a vehicle's energy management system, which directs crash energy around the vehicle compartment. If the windshield is improperly installed, the vehicle may crumple differently than the manufacturer intended, jeopardizing its occupants.
Rollover Strength
In a rollover accident, the windshield provides strength, keeping the roof from crushing in on the occupants. In some model designs, the windshield supplies up to 60% of the vehicle's rollover strength.
Occupant Retention
The windshield is intended to keep unrestrained occupants inside the vehicle. During a crash, a person is 25 times more likely to survive if he/she is contained inside the passenger compartment.