Bureau of Transportation Statistics (BTS)
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TABLE 8 - Mikrozensus 2000: Detour Factors Between Different Distance Estimates

34,195 car passenger and driver interzonal trips

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Distance band
(km)
Average detour factor with respect to
Crow-fly distance
Average detour factor with respect to
Shortest distance path
Average detour factor with respect to
Shortest time path
SDPD STPD Mean UE distance STPD Mean UE distance Mean UE distance
0-5 1.83 1.87 1.88 1.01 1.02 1.01
5-10 1.39 1.46 1.46 1.04 1.05 1.00
10-25 1.35 1.47 1.47 1.09 1.09 1.00
25-50 1.31 1.46 1.46 1.11 1.11 1.00
50-75 1.31 1.47 1.47 1.12 1.12 1.00
75-100 1.32 1.49 1.49 1.13 1.13 1.00
>100 1.26 1.48 1.48 1.16 1.16 1.00
Total 1.54 1.62 1.62 1.05 1.05 1.00

Key: SDPD = shortest distance path distance; STPD = shortest time path distance; UE = user equilibrium.