exactly but that's the problem. We (drivers) drive many miles for a long time. What are the chance of us running over a human body in middle of highway?? so when we feel a thud - that's when we just shrugged it off. I never usually stop after I hear "thud" but only after a really really bad thud. Most of time - I just cursed, thinking I ran over a nasty pothole or roadkill animal or some object like a piece of tire.
it's not like what you see in the movie where a car would crash after hitting a person because how is that possible? a mere 150 lbs person budging a 4,000+ lbs suv??