Most of that would be used to reduce, from $500 million to $200 million, the level of transportation borrowing that Walker proposes for the next two-year budget. It would also eliminate a transfer of funding from the general fund to the transportation fund.

Kooyenga said applying the sales tax to gas would allow revenue to grow with inflation over time. He said he would support a price cap for the tax to avoid the potentially volatile fallout of gas prices spiking and dropping, which happened during the Great Recession.

The plan would create an annual fee of $30 for hybrid vehicles and $125 for electric vehicles, yielding about $4.8 million over the next two years.

Other parts of the plan would repeal the prevailing, or minimum, wage for workers on state-funded construction projects, give local governments control over roundabout construction and seek federal approval to begin tolling U.S. interstates in Wisconsin. The plan also would replace 180 state Department of Transportation engineer positions with private contractors — a reversal from four years ago when the state hired those positions to save on costs.