I noticed that litte feature in VCS actually. When you drove over a body the car would... feel it. So obviously this feature will be even more realistic in IV. People should really get crushed underneath heavier wheels.
Say you drove over a body in a Freeway, then it would just explode and blood would spray out. If you drove over it in a Blista Compact then it wouldn't be affected, the car would just bounce over it.
I have a sick mind