Passenger-Miles of Travel
Passenger-Miles of TravelEstimated U.S. passenger-miles of travel (pmt) increased 24 percent between 1991 and 2001. Pmt totaled an estimated 4.8 trillion in 2001,1 averaging about 17,000 miles for every man, woman, and child (box 2-A) [2, 3].
Just over 85 percent of pmt in 2001...