Extensions of theoretical capacity models to account for special conditions

Extensions of theoretical capacity models to account for special conditions

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Article ID: iaor19993013
Country: United Kingdom
Volume: 33A
Issue: 3/4
Start Page Number: 217
End Page Number: 236
Publication Date: Apr 1999
Journal: Transportation Research. Part A, Policy and Practice
Authors: , , , , , , ,
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’.

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