All around great and very interesting and varied answers gentlemen.
Resist, Ord, I've heard a lot of what you're talking about: just going right through.
Paul S - Don't feel bad, I've posted this scenario in a couple other groups as well and many have said the same thing; just to run the figure over. Seems to be more prevalent than many people think.
Slippy - In all honesty, if I were alone, I'd probably cautiously drive closer to the figure while eyeing the surroundings for possible kill zone angles and movement from the foliage/trees. Might poke the figure to see if it's someone in need. No reaction, continue on.
Now if I were with family, I really don't know...would probably go around since my family is more important than anything, but man would I feel bad later that it might have been someone who needed assistance and I decided not to investigate further, you know?
--Ian