Traditionally, state governments have funded road construction through taxes on fuel. As vehicles become more efficient, though, the income from fuel tax is affected, with long-term concerns that it might eventually become insufficient. An increase in electric cars – and the introduction of electric trucks (Tesla recently unveiled an electric semi-truck) is starting to cause revenues to drop. With more than 90 percent of federal Highway Trust Fund receipts being collected at the pump, this is a very real concern.

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