Allow me to disagree with you, friend. I consider roads an essential function of government, and Ike did too, as another link in national defense.
Eisenhower favored the Interstate System being paid for by tolling, but was overruled by Congress.
Today, in retrospect, we know that the "free" IS System was a failure because it was "free".
First, there was never the political will or ability to tax at the level needed to maintain, replace, rebuild, reconfigure, expand. The system is worn out and inadequate. Today, the cost of just patching consumes huge amounts of money.
Second, the "free" roads promoted urban development that was detrimental to the condition and the capacity of the system.
You are using national defense as an excuse . . . unless you are willing to demonstrate how the private operation of a road negatively impacts our national security.