Objective Reality: "I will go on-record as saying the Segway is a really bad idea, at least with regard to sidewalks.
So we wind up with Force = 116 * (20 squared) = 46400 Newtons, I think. What does that equal? A sledgehammer swung full-strength by a lumberjack?"
B Knotts: "We're going to have to rethink cities!"
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IF the Segway and other 'personal transporters' become prevalent, we will face a need to accommodate the class of transportation whose speed and mass falls between that of the auto and the pedestrian.
So, "We're going to have to rethink cities!"
But -- it has already been done!
Over twenty-five years ago, Taipei, Taiwan, established special travel lanes for the 'personal transport' class of vehicles, such as bicycles, motorized bikes, mopeds, etc. The rightmost (closest to the curb) lane in the street is striped off, clearly marked (with white diamonds) and is strictly reserved for 'bike/Segway class' of vehicles. IIRC, the lane (which is deliberately made too narrow for an auto) is called (pardon my poor phonetics here) something like "Matsu-Dao".
In the small photo above, you can see what would be the 'Segway lane' just to the right of the curb. (BTW, Taiwan traffic drives on the right, just as we do here in the U.S.)
TXnMA (No Longer!!!)