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I'm less familiar with the economics of it in Europe, where gas taxes are much, much higher than in the US, and there's not nearly as much road and highway sprawl.

> more cash is spent in social services paid by fuel taxes

That might be the case in Europe, but it's not true of the US. Here fuel taxes only cover about 50% of the cost of roads with the rest coming from the general fund.

Compare the all-in cost spent supporting drivers (including e.g. the value of public land that's used for roads) with the total revenue received from them.