Table 5,,,, Highway Vehicle-Miles Traveled per Driving Age 16+ Population Equation Estimation,,,, Dependent variable: vehicle miles traveled per driver,,,, Method: least squares,,,, Sample (adjusted): February 2000 to June 2003,,,, Included observations: 41 after adjustments,,,, Variable,Coefficient,Standard error,t-Statistic,Probability RPM per departure,-0.989,0.398,-2.483,0.018 Income per population 16+,0.035,0.001,58.356,0.000 Exponential Dummy 9/11,-44.820,13.488,-3.323,0.002 AR(1),0.797,0.107,7.415,0.000 R-squared,0.748,    ,, Adjusted R-squared,0.727,    ,, "SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics.",,,,