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I see the posibility of an alliance between bicyclists and segway enthusiasts. Segway's problem is going to be its use on sidewalks because of Pedestrian-segway collisions and the fact that segway's speed will be limited by frequent red-light crossings. They might be more acceptable if its speed on sidewalks was limited to say 5 mph and lanes shared with non-pedestrian/non-automobile traffic was provided for express travel.
I wonder what the differential in infrastructure maintenance costs between automobile use versus segway use would be? I imagine an army of Segways would do less damage to infrastructure than 10 automobiles.
Until public officials have experienced mobility on a Segway, I'm not sure we can assess what the potential conflicts with traditional walkers would be and to what extent is it a real rather than preceived problem. Even modest Segway use for short trips could alleviate parking problems.
Here's another motivation to become ADA compliant.