I know someone who landed his 150 on a busy interstate successfully with no damage. Immediately afterwards, he was able to get the plane off to the side of the road and then traffic proceeded normally. However an agressive highway patrol guy told him he'd need to get his plane completely away from the interstate within two hours (or something short like that) or they'd demo it and haul it away to a junk yard. He called up a lot of his friends, they removed the wings, and were able to get it on a trailer back to an airport to save it on very short notice. From what he told me about the flight, I strongly suspect he ran out of fuel, but was sort of in denial about it.