well, Europe (in general, because I don't know the specifics off the top of my head) regulations require(d) changes to hood/bumper/front-end designs to improve pedestrian survivability during impacts.

I know that they require 1" (or 2.54cm) of space between hood and engine, to create a little crush zone before people hit parts that won't deform.

That's the only thing I know about it, and my source is a review of a C7 Corvette ZR1 (which Chevy cannot sell in the EU to my knowledge - due to the fact that the engine forms part of the hood)