Ranking of States (2016). Federal Highway Administration. Motorcycles (Registered Vehicles): Total Motorcycles Registered | Country: USA, 2016. Data-Planet™ Statistical Ready Reference by Conquest Systems, Inc. Dataset-ID: 013-006-003.

Federal Highway Administration
Federal Highway Administration (2018). Motorcycles (Registered Vehicles): Total Motorcycles Registered | Country: USA, 1995-2016. Data-Planet™ Statistical Ready Reference by Conquest Systems, Inc. [Data-file]. Dataset-ID: 013-006-003. Dataset: Vehicle registrations, for all motorcycles. State motorcycle registration data reported to FHwA Office of Highway Policy Information and published as part of the annual Highway Statistics Series. The vehicle registration date varies among the States. Although many States continue to register specific vehicle types on a calendar year basis,...
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