Congress needs to determine how to fund the Highway Trust Fund for the long-term, write Steve Bell, Shai Akabas and Emil Frankel of the Bipartisan Policy Center. They can choose to raise the gas tax and tie it to inflation, add new user fees or use the general funds or any combination thereof. But, whatever they choose must be sustainable, the three argue. “Failing to answer the vital question of how to sustainably pay for surface transportation prevents the effective restoration and expansion of our country’s infrastructure, upon which so much of our economy depends,” they note.