Bureau of Transportation Statistics (BTS)
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TABLE 11 - 2001 NPTS: Distribution of the Relative Deviations of Reported to STPD Estimates by Distance

20,700 car passenger and driver trips below 100 km

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STPD (km) Share of trips with relative deviations of reported to SDPD estimates (%)
Within the measuring uncertainty <5 5-10 10-25 25-50 ≥50 Total
0-9 28.2 8.7 8.2 19.5 19.1 16.3 100.0
10-19 17.1 15.9 13.2 23.8 15.9 14.1 100.0
20-29 12.6 18.0 18.1 26.4 14.1 10.7 100.0
30-39 13.4 24.3 14.8 22.6 12.1 12.8 100.0
40-49 9.5 23.9 27.6 22.1 5.5 11.3 100.0
≥50 7.1 25.5 18.4 24.1 9.4 15.5 100.0
Total 23.6 12.0 10.7 21.1 17.4 15.3 100.0

Key: SDPD = shortest distance path distance; STPD = shortest time path distance.

Note: Rows may not add to 100.0 because of rounding.