Rant: Shitty fucking dangerous drivers

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At a combined impact velocity of a hundred miles per hour

Opposing velocity vectors aren't additive like that. Two people going at 50 mph toward each other will experience a crash of 50 mph. This is proven by thinking of two situations:

1) two cars crashing at 50 mph
2) a car crashing into a sturdy wall at 50 mph

Both will result in that car being stationary after the crash. In the case of the wall, it means the wall supplied a force equal, but opposite, to the car's force, leaving it stationary. The wall wasn't moving though. Therefore, in the first example, the second car is acting like a stationary wall, thus meaning that the experienced force is that of 50 mph.

/physics

You're lucky you don't live in Australia. On a daily basis I see shocking drivers...

Good explanation, I also raised an eyebrow on that part lol you can't add velocities like that, it doesn't work. Although two cars crashing will be like a car hitting a sturdy wall provided that the cars have equal mass I'm sure.