This section provides information about State motor-vehicle registrations and fees, including all charges (including driver licenses receipts) associated with vehicles and their operation. Taxes and fees connected with special taxes on motor carriers are given. These tables can be found in the highway finance section. The vehicle registration data varies among the States. Although many States continue to register specific vehicle types on a calendar year basis, all States use some form of the "staggered" system to register motor vehicles. Registration practices for commercial vehicles differ greatly among States. The FHWA data include all vehicles which have been registered at any time throughout the calendar year. Data include vehicles which were retired during the year and vehicles that were registered in more than one State. In some States, it is also possible that contrary to the FHWA reporting instructions, vehicles which have been registered twice in the same State may be reported as two vehicles.