Colorado drivers would begin paying a new fee of 2 cents on every gallon of gas they purchase starting in July 2022 under legislation Democratic state lawmakers are expected to introduce in the coming weeks.

That fee, which would not require voter approval, would increase to 8 cents per gallon starting in July 2028 under the proposal, which is part of a $4 billion, 11-year effort to raise and spend money for badly needed transportation projects across the state.

Lawmakers, political groups and business interests have been trying for years, without much luck, to find a transportation funding solution. The proposal, which includes a number of other new road-usage fees, is backed by Gov. Jared Polis and also aims to reduce traffic congestion on Colorado’s roads, expand public transportation and improve air quality by making it easier for people to own electric vehicles and spending millions on environmental initiatives.

“We think this is the time that we absolutely have to get something done and something meaningful,” said Senate Majority Leader Steve Fenberg, a Boulder Democrat. “Not a baby step, but a real meaningful step toward solving the transportation problems that we have in our state.”