marriage made in heaven traffic case la noire what does investigating the blood stains and tire marks tell me?

Answer 1

Spoiler Alert:

 

Tire marks tell you the driver stopped after hitting the person. And it wasn't a hit and run.

large Blood stain away from the blood trail suggests that he came into the street already bleeding.

The distance between the first stain and the blood trail is the distance he was airborne.

Answer 2

Anonymous is correct. That's what it tells you. Unfortunately, that information doesn't help you at all in the rest of the case. For more info, see this guide: http://www.sleeandtopher.com/guide/l-a-noire-a-marriage-made-in-heaven-case-guide/