Originally Posted by John Forester

Both Genec's and Hagen's comments apply to competitive activities in which some succeed and some fail. That was not the case in the child cycling classes that I taught; almost (possibly all) of those who completed the program up to the final test on real roads in real traffic (the same conditions in which they had been trained) past the test. Class average scores were about 95% when the average score for the local adults on the roads at commuting times was a miserable, and flunking, 55%. You see, obeying the rules of the road for drivers of vehicles is quite an easy task that almost anyone can do. I have had adult students who have overcome disabilities as well, although I have had a very few adult students whom I had to advise to not try to learn vehicular cycling. In each case, these persons could not control their bicycles through subconscious activity, but had to continually think about controlling their bicycle to such an extent that they could not pay the proper attention to traffic. My guess, based on very little information, is that these might be 2% of the adult population.