The USA is at a crit­ical junc­ture in how it pays for roads, bridges and transit. That’s because the fed­eral tax on gaso­line, the pri­mary method since 1956, has lost one-​​third of its buying power since it was last raised in 1993. States add their own tax on top of that, but the fed­eral tax accounts for about 45%-50% of cap­ital spending for transportation.

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