Frankly I'm non-plussed by the IMHO dopey & simplistic "speed kills" mantra: it ignores so many other factors that can and do cause crashes on a daily basis.
Doing 20km an hour in the middle lane of the M5 is stupid and dangerous, as would be doing 220km/hr.
Would someone care to explain specifically why the German autobahns have 10x better safety than the speed limited roads there????
If the speed mantra were true this would clearly not be the case.
BTW as for basic physics, I was referring to the momentum of the truck.... Darwin awards are freely available for those who wish to step in front of one ( as clearly slow moving truck must be safe
)