Huge unfairness. Research by Peter Mumford in the Adam Smith Institute report The Road From Inequity shows that the current system - where we pay for roads through tax on fuel - is completely unfair. People in rural areas have to drive long distances, so they pay a lot. But the roads they use are uncongested, there are few accidents, and they can drive at efficient speeds through relatively unpopulated areas. In towns, by contrast, people drive short distances and so pay little.