eTextbook: Traffic and Highway Engineering, Enhanced SI Edition, 5th Edition

Nicholas J. Garber is the Henry L. Kinnier Emeritus Professor of Civil Engineering at the University of Virginia, where he served as Chairman of the Department from 1996 to 2002. Before joining the University of Virginia, Dr. Garber was Professor of Civil Engineering in the faculty of engineering at the University of Sierra Leone, where he was also the Dean of the Faculty of Engineering. At the State University of New York at Buffalo, he played an important role in the development of the graduate program in transportation engineering. For several years he was a design engineer for consulting engineering firms in London, and he also worked as an area engineer and assistant resident engineer in Sierra Leone.

Lester A. Hoel is the L.A. Lacy Distinguished Professor Emeritus of Engineering at the University of Virginia. He held the Hamilton Professorship in Civil Engineering from 1974 to 1999. From 1974 to 1989, he was Chairman of the Department of Civil Engineering. Before this, he served as Professor of Civil Engineering and Associate Director at the Transportation Research Institute at Carnegie Mellon University. Dr. Hoel is a member of the National Academy of Engineering, a Distinguished Member of the American Society of Civil Engineers and a Fellow of the Institute of Transportation Engineers.