Too many drivers just have faith that the road ahead is clear of hazards even if they can't see it.
Next time you're on a hilly road, observe all the skid marks just on the other side of hills near intersections. Often times it's school buses that are being hit. It's so bad that many governments are now putting up signs warning that a bus stop is ahead on the other side of a hill or around a corner.
There’s a narrow, winding, hilly local road near my neighborhood with no shoulders. I don’t know how many times I’ve topped a hill on that road, only to find a road crew, school bus or something stopped dead on the road just over the crest of the hill. In those situations I always try to stop on top of the hill, rather than on the downslope where following cars won’t see me. If you have to stop on a road and you have some choice about where to do it, think about the guy behind you.