Originally Posted by K!NkY
I am surprised to hear that air bags don't work because of crash guards? The company outlet themselves sell crash guards and air bag in Indian cars have you ever seen a car that glow air bag during accident?
Most of the crash guards sold by the company outlets are not by the company themselves, but are by the dealerships to earn some extra money. And why would these guys care about your life and safety, when they are generating additional revenue...
In the event of a frontal collision, the bonnet of a car is designed to deform (crumple) and transfer/absorb all the forces of the collision. This happens when the entire front end of the car comes in contact with the colliding object.
A typical crash guard is bolted on to the chassis of the car. When it collides with an object, rather than transferring the collision force onto the body of the car, it accumulates the entire force into a single point, which is the chassis of the car, thereby causing greater damage. Also, since the guard is not design to crumple on impact, the forces are not transferred to the body and in many cases, the airbags dont deflate.
You may read the following articles: Bullbars | Australasian College of Road Safety Bullbars (Factsheet 22) | NZ Transport Agency