Some Boston sidewalks are crowded and narrow, so I can see how adding a segway, which is about twice as wide as a person, is not a welcome addition.
Width of a Bugaboo Cameleon: 23.9"
I'd like to see the Boston city council try to ban strollers.
Instead of yet another regulation on the books, why not just punish those individuals that actually cause injury to others, using the already existing mechanisms for doing so? That way the individuals who can navigate down a sidewalk without harming others can be left in peace.
I would not welcome segways on crowded sidewalks. The road analogy would be huge double-wide trucks traveling about 100 mph on your daily interstate commute. Ignore the danger--the comparison is to how annoying it would be.