The blocked time is a portion of effective permitted left-turn green time blocked by opposing traffic until the left-turn vehicle can get an acceptable gap to complete a permitted left turn. In the Highway Capacity Manual, it is designated as the opposing approach queue clearance time, gq. The blocked time, denoted as gb, is a critical parameter in estimating delay for a signalized intersection because it affects not only left-turn saturation flow but also the shape of the delay area. This paper proposes a model for estimating blocked time for a left-turn lane group with two opposing lanes for well- and poorly coordinated signals. The proposed model was developed by directly considering the arrival types. Possible platoon arrival patterns during the green interval were categorized and then used to estimate the blocked time of the left-turn lane group. A comparison of the results from the proposed model and the existing models with CORSIM results indicated that the proposed model is more realistic in estimating the blocked time for left turns.
Blocked Time of Permitted Left-Turn Lane Group with Two Opposing Lanes for Two Arrival Types
Transportation Research Record
Transportation Research Record: Journal of the Transportation Research Board ; 1988 , 1 ; 138-146
2006-01-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Blocked Time of Permitted Left-Turn Lane Group with Two Opposing Lanes for Two Arrival Types
Transportation Research Record | 2006
|Blocked Time of Permitted Left-Turn Lane Group with Two Opposing Lanes for Two Arrival Types
British Library Conference Proceedings | 2006
|Blocked Time of Permitted Left-Turn Lane Group with Two Opposing Lanes for Two Arrival Types
Online Contents | 2006
|Implementation of Wider Lane Lines to Improve Sight Distance from Opposing Left-Turn Lanes
Transportation Research Record | 2000
|Implementation of Wider Lane Lines to Improve Sight Distance from Opposing Left-Turn Lanes
Online Contents | 2000
|