Letter to the Editor—On a paper by C. Hendrickson and G. Kocur entitled “Schedule Delay and Departure Time Decisions in a Deterministic Model”

A recent paper in this journal by Hendrickson and Kocur (Hendrickson, C., G. Kocur. 1981. Schedule delay and departure time decisions in a deterministic model. Transp. Sci.15 62–77.) presents a deterministic model of peak period commuting, where departure times, arrival patterns and commuting costs are solved for. It may interest readers to know that this problem in a form almost identical to Hendrickson and Kocur was first solved by Vickrey (Vickrey, W. S. 1969. Congestion theory and transport investment. Am. Econ. Rev.59 251–261.). Author's Closure follows.