I actually see a white sheeted, or yellow bagged body once every three months, or so along the shoulders of Los Angeles freeways. Lots of people, lots of cars, lots of accidents. Plenty of transients and working folk doing what they do along offramps too.
Similar story here, heading down in Massachusetts. When you're near the big cities with lots of fast moving traffic merging everywhere, it seems like there's a cross every half mile on the side of the road. The people drive like maniacs and their transport infrastructure is almost Escher-esque...