New financial analysis finds that investments of just over $300 billion over the last ten years under federal transportation programs have helped improve the Interstate highway system and rehabilitate the nation’s bridges, though many states have used federal accounting loopholes to shift money out of bridge repair, traffic safety and air pollution reduction accounts in favor of other priorities.

STPP's analysis of ten years of federal spending, titled "The $300 Billion Question: Are We Buying A Better Transportation System?" is presented here in a series of short papers with state-level data in tables: