Beginning in 1881, isolated prototypes of electric tricycles and bicycles were patented and sometimes tested. Limited editions followed in the 1940s, but it was not until the lithium-ion battery became available in the first decade of this century that urban pedelecs and more powerful open-road motorcycles--sometimes with speeds of over 200 mph--became possible and increasingly popular. Today's ever-growing fleets of one-wheel, two-wheel...
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Transportation