And some interesting links on the topic:

http://www.grandprix.com/ft/ftpw016.html
     (Grand Prix  crash barrier technology - mainly concrete walls and tyre
walls)
http://www.esi.co.kr/paper/europam/europam2000/day1/ses2/pres2.pdf
     (Seems to talk about car-to-car frontal collisions)

and others turned up in this search on Google:
"car crash impact momentum absorbed by wall"

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu