Quote:
Originally Posted by SebC
If the bike were going left-to-right, the lines would not cross over on the right side. Also, maintaining a constant distance between the lines, it becomes almost impossible to follow the path - the rear tire has to reverse itself or at least stop for a long time. Attempting such a manoeuvre would likely result in a crash (though still a really abrupt turn going right-to-left as well).
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I think you've come closest to really articulating why the bike has to be moving right-to-left. There is a particular concept/idea I'm going for here that could be applied to any such tracks to determine the bike's direction.