Transportation Construction Coalition research shows that transportation legislation being pushed in Congress by Heritage Action, the Club for Growth and like-minded conservative activist groups would force states to raise their gasoline and diesel motor fuel taxes, on average, about 23.5 cents-per-gallon by 2020 if they wanted to maintain their current annual investment in highway and bridge improvements and public transportation, an analysis of federal and state data shows.  The states’ only other options, if the proposal was enacted, would be to raise other taxes, redirect an equivalent amount of revenue from other state programs, or slash their road, bridge and transit improvement program.