Extensions of theoretical capacity models to account for special conditions

Bruce W. Robinson, Zongzhong Tian, Wayne Kittelson, Mark Vandehey, Michael Kyte, Werner Brilon, Ning Wu and Rod Troutbeck

Transportation Research Part A: Policy and Practice, 1999, vol. 33, issue 3-4, 217-236

Abstract: The computational procedures used to analyze two-way stop-controlled intersections were extended in the National Cooperative Highway Research Project 3-46 to account for a number of effects commonly observed at actual unsignalized intersections. This paper presents theoretical extensions that can account for commonly observed phenomena, such as two-stage gap acceptance when median storage is available; right-turn "sneakers" at flared minor-street approaches; non-random arrivals caused by upstream signals; impedance due to pedestrian crossings; and delay to major-street through vehicles using shared left-turn and through lanes. The individual effects are then combined into an analytical framework suitable for inclusion in the Unsignalized Intersections procedures of the 1997 "Highway Capacity Manual". ©

Date: 1999
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