While I realize Eisenhower instated them, wouldn’t the normally “fiscally conservative” solution to interstate highways be privately-owned toll roads designed to nickle and dime users to death, more than any additional gas tax used to cover public road infrastructure would ever cost?
If you want a microcosm of that, just look at Florida’s “highways.” Almost every highway road is a toll road that drains you 1.50 every 5 miles you drive. Even within a city you gotta pay tolls unless you want to take surface streets everywhere.