Vehicle Collision with other vehicle issue

Why Does Colliding with other vehicles give unexpected results , the vehicle jumps and rotates for no reason. I am using 4.7.2

Is this a bug? Because its very unrealistic that vehicle at 10 kmph if collided with other vehicle will spring off and fell away like some bomb has exploded.

You can reproduce this bug easily, in vehicle starter kit add 2 vehicles and then collide them.

Closed, because of duplication:

https://answers.unrealengine.com/questions/201852/vehicle-collision-with-other-vehicle-issue-2.html