Bureau of Transportation Statistics (BTS)
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Table 9
Site Distribution Based on All Crashes

Highway class  Percentage Total Number of stations 
Interstates  Rural 11.97 6,695 5
Urban 6.13 3,437 2
U.S. roads  Rural 18.81 10,506 7
Urban 14.52 8,146 6
State roads  Rural 33.61 18,800 13
Urban 14.96 8,396 6
Total   100 55,980 38