Quote:
Originally Posted by FlyingScot
I don't doubt there are others, but I do doubt they are popular. Almost by definition, these are very low volume operations. Keep in mind that every car needs space between it and other cars on a single track, and no car can go faster than the car in front of it. This last piece is especially important--if there are 10 cars then the tenth car must be slower than the ninth, which must be slower than the eighth, which must be slower than the seventh...Otherwise it's a frustrating traffic jam. This is very different than bikes or walkers who can pass each other
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They are becoming popular, that is why they are starting to spring up all over the place.