In January 1993, a comprehensive study of traffic flow characteristics at two-way and all-way stop controlled intersections was initiated in the United States through the National Cooperative Highway Research Program (NCHRP). The primary motivation for this study was the need for a new set of capacity analysis procedures for stop-controlled intersections that were based on a comprehensive US data base. Phase I of this study has now been completed. During Phase I, traffic operations at seventeen stop-controlled intersections (twelve two-way stop-controlled intersections and five all-way stop-controlled intersections) were videotaped. This paper focuses on the saturation headway and critical gap data that have been collected as part of this study. For TWSC intersections, both critical gap and follow-up time estimates were made using both the Siegloch and maximum likelihood methods. For AWSC intersections, saturation headway estimates were made and compared with earlier results from Transportation Research Circular 373. (A)
Samenvatting