Michigan Gov. Rick Snyder plans to propose a more detailed plan to boost spending to maintain roads in next week's State of the State address.
Transportation funding is high on the Republican governor's agenda for 2013. His previous calls for an additional $1.4 billion a year for roads and bridges stalled in the Legislature.
Organizations supporting more transportation funding say the gap between what's spent to maintain roads and the amount of money needed to properly do the job grows every year.
Snyder in 2011 called for replacing the 19-cents-per-gallon tax on gasoline with a tax on the wholesale price of fuel. He also suggested a source of new revenue could be higher vehicle registration fees.
Snyder told reporters Tuesday he'll present new specifics in his Jan. 16 speech.