After more than a decade of watching Oregon and a handful of other states test alternatives to traditional gasoline taxes, more states, with the help of federal money, are now joining the quest.

Louisiana officials agree that the state’s roads need fixing. Beyond that, though, they can’t seem to agree on what to do about it. But they did make some progress earlier this month toward a solution when the state’s voters approved a constitutional amendment to safeguard any money raised by new gas taxes.

In his four years as U.S. transportation secretary, Anthony Foxx has pressed public officials and industry leaders to rethink many of their long-held assumptions about transportation. Lately, he’s been trying to make sure they continue to mull over his ideas even after he’s out of office.