William M. Sampson, P.E., is a professional engineer specializing in traffic signals and capacity analysis with over 40 years of experience. He was a faculty member of the University of Florida (UF) Department of Civil Engineering for over 30 years as the Director of the McTrans Center and responsible for technical assistance and ongoing development of the Highway Capacity Software (HCS). He taught two graduate courses on Traffic Engineering and Highway Capacity Analysis, publishing a textbook as well. Prior to UF, he ran a signal system with over 300 signals in an urban area with about 500,000 population. He is a former member of the Transportation Research Board (TRB) Highway Capacity and Quality of Service (HCQS) committee and still on several subcommittees.