Appendix A Methodology

The findings from the 2001 NHTS survey are based on travel data collected from a random digit dial sample of telephone interviews conducted with over 60,000 individuals in approximately 26,000 nationally representative households. Interviews were...

Figure 15 Forecasts of Air Revenue Passenger Miles

(Billions)

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Table E2 Forecasts and Forecast Errors for Rail RPM

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Figure 1 Real GDP

(2000 chained billions)

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SOURCE: U.S. Department of Commerce, Bureau of 51. Business Economic Analysis, Current-Dollar and Real Gross Domestic Product, seasonally adjusted, www.bea.gov.

Figure 16 Forecasts of Railroad Passenger Miles

(millions)

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Table B8 Distribution of Pre- and Post-9/11 Long-Distance Trips by Mode, for Each Trip Purpose

Percentage trips (standard error)

NOTE: Cells with a small sample size (< 30) or that have a covariance or c.v. (> 0.3) are shaded dark grey to indicate that the...

Table B11 Distribution of Pre- and Post-9/11 Long-Distance Trips by Mode, for Each Income Group

Percentage trips (standard error)

NOTE: Cells with a small sample size (< 30) or that have a covariance or c.v. (> 0.3) are shaded dark grey to indicate that the...

Figure 14 5 Year Average of Vehicle Miles Traveled Seasonality

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SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics.

Table B1 Distribution of Pre- and Post-9/11 Long-Distance Trips by Trip Purpose, for Each Mode

Percentage trips (standard error)

NOTE: Cells with a small sample size (< 30) or that have a covariance or c.v. (> 0.3) are shaded dark grey to indicate that the...

Table B5 Distribution of Pre- and Post-9/11 Long-Distance Trips by Trip Length, for Each Mode

Percentage trips (standard error)

NOTE: Cells with a small sample size (< 30) or that have a covariance or c.v. (> 0.3) are shaded dark grey to indicate that the...