One obvious problem is that the roads are too expensive to maintain, primarily because they are only built to last 20-30 years. Government expenditure favors e

One obvious problem is that the roads are too expensive to maintain, primarily because they are only built to last 20-30 years. Government expenditure favors employment over long lived infrastructure. Legislators favor distributing funds to contractors who may reciprocate with campaign funding. There's no technical reason why these roads could not be put in to last far longer than 20-30 years without major repairs. Source: family member was a civil engineer specializing in road pavement and construction for many decadeds.