LANSING, MI - Michigan lawmakers have proposed a 6-cent increase in the state's diesel tax to help pay for road improvements, the Associated Press reported.

Under the bills introduced Jan. 26, the state's 15-cent per gallon diesel tax would rise to 21 cents this year, a 40 percent increase. It would rise to 27 cents in 2013, AP said.

The 19-cent per gallon gas tax would increase to 23 cents this year under the proposal, and then 27 cents in 2013, AP said. The taxes would raise an additional $480 million per year once fully implemented.