Originally Posted by
jeffpoulin
....
I live in the Alps where we have more than a few steep hills. No warning signs for cyclists, though. OTOH, there are lots of warning signs about cliffs for skiers....
It's about expectations and deviation from the norm. I wouldn't expect hill warnings in hilly or mountainous areas, just as I wouldn't expect "warning, sharp edges" on a knife.
OTOH- skiers might need notice that a slope is changing to a cliff.