Table A3 Development of Truck Ton-Mile Estimates,,,,,,,,,,,,,,
,1990,1991,1992,1993,1994,1995,1996,1997,1998,1999,2000,2001,2002,2003p
Oak Ridge National Lab estimate (billions)1,,,,910,,,,"1,109",,,,,,
Single-unit truck VMT (billions)2,52,53,54,57,61,63,64,67,68,70,71,72,76,78
Combination truck VMT (billions)2,94,97,100,103,109,115,119,125,128,132,135,137,139,138
Total truck VMT (billions),146,150,153,160,170,178,183,191,196,203,206,209,215,216
"Truck VMT index, 1993 base",0.915,0.935,0.959,1.000,1.065,1.114,1.144,1.197,1.228,1.268,1.285,1.307,1.342,1.350
"Estimated truck traffic, 1993 base (billion ton-miles)",832,851,873,910,968,"1,014","1,041","1,089","1,117","1,153","1,169","1,189","1,221","1,228"
"Truck VMT index, 1997 base",0.764,0.782,0.802,0.836,0.890,0.931,0.956,1.000,1.026,1.059,1.074,1.092,1.122 ,1.128 
"Estimated truck traffic, 1997 base (billion ton-miles)",848,867,889,927,987,"1,033","1,060","1,109","1,138","1,175","1,191","1,212","1,244","1,251"
"1 U.S. Department of Transportation, Bureau of Transportation Statistics, Transportation Statistics Annual Report (Washington, DC: 2000), p. 124.",,,,,,,,,,,,,,
"2 U.S. Department of Transportation, Federal Highway Administration, Highway Statistics (Washington, DC: 1990–2003), table VM-1.",,,,,,,,,,,,,,
Key: p = preliminary; VMT = vehicle-miles traveled.,,,,,,,,,,,,,,