Panos G. Michalopoulos, Jerome O'Connor

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This paper addresses the problem of estimating left-turn saturation flows at both signalized and unsignalized intersections. The methods for estimating this traffic measure were tested for reliability against field data. A new approach to the problem is also presented. The results are applicable to left-turning traffic flowing through gaps of suitable size in the opposing traffic without the protection of a special signal phase. Both one and two lanes of opposing traffic were considered, as were unsignalized intersections. The gap-acceptance functions that best represent the behavioral patterns of left turners at these intersections are also presented. Time-lapse photography was used to collect data at five different intersections in upstate New York.

Original languageEnglish (US)
Pages (from-to)35-41
Number of pages7
JournalTransportation Research Record
Issue number667
StatePublished - Jan 1 1978


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