Originally Posted by
roundypndr
Many cyclists are generally attentive to their surroundings, but I go by the saying, "Some fool will always outsmart an engineer's best determined efforts", and that goes for drivers, cyclists, and pedestrians.
Yes, but if you go by that saying, you literally cannot put up any sort of barrier or sign. Bicyclists have been severely injured running into bollards, for example.
Really, if the standard is everything has to be completely foolproof, then roads and paths are themselves impossible.