Figure 1: Causes of congestion in the United States

Figure 1. Pie chart of causes of traffic congestion in the United States. Nonrecurrent congestion totals 55 percent, including traffic incidents, 25 percent; bad weather, 15 percent; work zones, 10 percent; and special events, 5 percent. Recurrent congestion totals 45 percent, including bottlenecks, 40 percent, and poor signal timing, 5 percent.

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