Bureau of Transportation Statistics (BTS)
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TABLE 10 - 2001 NPTS: Mean and Median Detour Factors Between STPD and Crow-Fly Distance by Distance Band

20,700 car passenger and driver trips below 100 km

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Distance band
(km)
Detour factor
Mean Median
0-9 1.56 1.48
10-19 1.42 1.34
20-29 1.40 1.33
30-39 1.37 1.32
40-49 1.40 1.36
≥50 1.43 1.35
Total 1.51 1.42

Key: STPD = shortest time path distance.