Don't know if this has been said before, but say you damage the rear of your car loads, then the front takes not damage at all.
For instance, take a look at this http://img376.imageshack.us/img376/562/wreckedit6.png
Once youve got high damage to the rear the front wont smash up
For instance, take a look at this http://img376.imageshack.us/img376/562/wreckedit6.png
Once youve got high damage to the rear the front wont smash up