Quote Originally Posted by viper8548 View Post
Well the equivalent is definitely more than 80km/h to a wall :P
What do you mean? 80km/h to the wall will kill people already from the internal injuries sustained from the deceleration forces.

You have to calculate it in order to determine which has more damage to the car. In both cases, momentum is conserved, but for inelastic collisions kinetic energy is lost as the car crumples. In a 2 car head on collision, the lost energy is absorbed by both cars crumpling. In a car-to-wall collision, the energy is absorbed by the car alone since the wall is immovable. So my guess is that a 80km/h wall test is equivalent to 2 cars head on at 80km/h (total 160km/h) assuming that both cars crumple the same and absorbed the same energy.