Watched an interesting documentary type show on Nat-Geo last year,,, which was about how the brain works and how it recognizes and reacts to various situations. One example that they happened to use was about how many auto drivers fail to react rationally towards motorcycles. After years of driving,, they stated that it largely becomes a series of automatic responses, where the brain simply makes a practiced and unthinking reaction based on what it is shown. 95 percent of what it sees on the road are cars or trucks (which it just sees as a big car). So when the eyes show the brain that a motorcycle is approaching,,, the brain says "that's not a car" and thus no reaction is required. The cager pulls out,, or turns left in front of oncoming because,, they most often do not recognize that there is any reason not too. The show went on to site other examples of odd brain behaviors,,, but that one stuck with me !! Cat'