Factors and trends in trip lengths. - Alan M. Voorhees & Associates (Washington, D.C. Highway Research Board, Division of Engineering, National Research Council, National Academy of Sciences-National Academy of Engineering, 1968)
"NCHRP project 7-4 '64 & '65 continued."
"Research sponsored by the American Association of State Highway Officials in cooperation with the Bureau of Public Roads."
Bibliography: p. 68-70.
Keywords: Trip length