What will happen as the car thrusts into a place with height restriction

Under the guard and in the tunnel etc., a warning such as "height restriction ○ ○ m" etc. is displayed, and a tall car can not pass though, but as soon as the car forcibly thrusts into the place with such height limit It is a movie that you can see how it will become.

Details are as below. Truck to rush under the guard of the railroad. The roof has been scraped and replaced.
LiveLeak_com - Another box truck gets stuck under railway bridge over Gregson Street, Durham


This guard is in North Carolina but it seems that under the demon guard where 46 accidents have occurred since 2000. The height is 11 feet 8 inches (about 3.5 meters), and a yellow warning sign and a warning light that emits light with sensing are also installed, but accident seems to happen.

A movie with a yellow track penetrating. I manage to escape back somehow.
LiveLeak_com - Yet another box truck rips its roof off under railway bridge


Truck that restricted the speed at about 40 km at a speed of about 60 km / h. We succeeded in getting through while the cargo part was destroyed.
LiveLeak_com - Boxtruck goes topless under railroad trestle