A look ahead: Year 2020. Proceedings of the conference on long-range trends and requirements for the nation's highway and public transit systems: (Special Report, No. 220). Transportation Research Board, National Research Council, 2101 Constitution Ave., N.W., Washington, DC 20418, U.S.A., 1988. 551 pp. + vi. ISBN 0-309-04702-1. $20.00 (paper)