Fuel taxes are the primary source of funding for state and federal transportation programs and have been for well over 80 years. However, the long term viability of this revenue source is in question, and many states are looking at funding alternatives to the fuel tax. Among the most promising are fees directly related to road use. This report summarizes recent efforts at the state level to research and, in one case, implement road user charging systems as a replacement for the fuel tax. This report also presents a brief overview of recently filed federal legislation related to road user charging and discusses a few collaborative multistate initiatives.