Fred Mahe, a 36-year-old software salesman, twists his tie into a neat knot while riding his skateboard up Madison Avenue from his home in the Financial District to his office at 42nd Street and 3rd Avenue. "It's like a magic carpet," he said of his trusty transport. "You just kind of stand on it and it goes."
Mr. Mahe doesn't ride to work every day ("Some days it's all you can do to find your way to the train," he said),...
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