Found more info:

http://www.bip2010.be/fr/index.php?titre=liege&idlieu=15&part=artistes&artiste=1- 0
but here the cars are different
Note the Opel grille on the bottom car
same as the ones on my photo:
http://www.dhnet.be/regions/liege/article/290640/un-tas-de-voitures.html
It looks like they had to reinforce the cars (and replace the most crushed one)

on that other page:
http://www.bip-liege.org/fr/index.php?titre=liege&idlieu=15
they say it is there until end of April.

http://www.liegecity.be/v10/index.php?option=com_content&view=article&id=354:the-chase&catid=2:culture&Itemid=4
here the bottom car still had its grille