I hate to sound like a downer but this wouldn't even look realistic. Notice how there is 0% blood covering the logo, license plate, or headlights, the later two for obvious reasons...
Why would you even want to do that....? I'm pretty sure people only walk out in front of cars when they don't see them, so blood isn't gonna stop them. You're only ruining the car.
Not always ns I've had plenty of people with mothballs in their head look right at me and still stroll right out in front of me when I'm going close to fifty mph and I tell you getting 6000 pounds of steel stopped before committing retroactive birth control is a feat!
Somebody already mentioned this 5 days ago.