Not until Henry Ford mass produced the Model T in 1913 were most people able to afford cars. Ford's car gave the middle class the freedom and mobility that once had only been available to the upper class. Now movement transcended class lines. Although all pay the same taxes and prices for road construction and gasoline, the people of lower income end up paying a larger percentage of their income to have a car. Paying for the use of a road, though, is an entirely different issue.
Federal funds pay for county, city, state, and national roads.
Toll roads, on the other hand, are paid for directly out of the users' pockets. Toll roads' expense creates inequality as only the rich can afford to drive them. The message toll roads manifest is that speed and movement are yours only if you can pay for it. Some suggest that forcing tolls on all highways would reduce emissions by reducing the amount that people would drive because they would be reluctant to pay extra to drive. This sort of mentality creates an elitist situation, where once again only the upper class can afford to be mobile.