If you needed another reminder why you really don't want to get rear ended by a commercial truck while sitting in your car, here it is. This German crash test is intended to show what happens when a truck plows into cars parked behind another stopped commercial truck.
Frighteningly enough, this truck was only travelling 43 MPH when it plowed into the Mitsubishi Lancer wagon and 1990s Renault Megane shown here. German ADAC produced this video in an effort to gain support for making the inclusion of emergency brake assist on large trucks mandatory.
We don't speak German, nor are we particularly familiar with the specifics of emergency brake assist but if it stops this kind of thing from happening, we support it. (Crash begins at 1:30)