Persons engaged in cycling are referred to as “cyclists”, “bikers”, or less commonly, as “bicyclists”. Apart from two-wheeled bicycles, “cycling” also includes the riding of unicycles, tricycles, quadracycles, recumbent and similar human-powered vehicles (HPVs). Bicycles were introduced in the 19th century and now number approximately one billion worldwide. They are the principal means of transportation in many parts of the world. Cycling is widely regarded as a very effective and efficient mode of transportation optimal for short to moderate distances.
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