In a state-less world, the organic solution to road construction and maintenance might look something like this: institutions that profit directly from the existence of roads, ie: gasoline marketers, would undertake funding roads. The cost of gas would reflect this, and you would pay more at the pump. But in this scenario of a state-less world, there's no income tax, so you can actually afford it. Pros: the funds go straight to entities that have a direct interest in efficient roads; people can't freeload (gotta buy fuel to use the roads); you're in control: don't want to pay, take the train.