He misstated the effect being equivalent to 2 cars hitting head on at 120mph each. It should have stated as "head on at 60mph each"...
"A head on traffic accident occurs when the front of one vehicle collides with the front of another.
These types of accidents are extremely dangerous because of the cumulative speed affect of
vehicles colliding in opposite directions. Accident reconstruction experts often refer to the
combined difference in speed as closing speed or closing velocity.
For example, if two vehicles collide head on with each traveling at 30 MPH, then the closing speed
between the two vehicles would be equal to 60 MPH. If the same two cars were to collide, with one
of the one of the vehicles stopped, then the striking vehicle would need to be traveling 60 MPH to
equal the same closing speed."
Either way you cut it, it's nasty!
