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- Between 1970 and 1999, the U.S. population grew by 33%. During this period, however, the U.S. Department of Transportation found that vehicle miles traveled grew disproportionately by 143%.
- According to the U.S. Environmental Protection Agency, although air quality has greatly improved, vehicles on the road account for at least 29% of air pollution emissions nationwide (29% of volatile organic compounds, 34% of nitrogen oxides and 51% of carbon monoxide).
- In 1999, the Texas Transportation Institute reported that congestion costs U.S. travelers 4.5 billion hours of delay, 6.8 billion gallons of wasted fuel and $78 billion in wasted time and fuel.
- Traffic congestion is no longer just a big-city problem. We spend five times as long stalled in traffic in small and medium-sized cities than in 1982, and this figure is growing at a far faster rate than in larger cities.
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