01152741

Component

https://doi.org/10.3141/2173-02

http://scholar.google.com...ilon&publication_year=2010

At two-way stop-controlled intersections without exclusive turning lanes on major streets, all three movements (right turn, through, and left turn) must share a lane. The "Highway Capacity Manual" (HCM) provides a special formula to deal with this lane configuration. However, this formula cannot consider short lanes such as left-turn pockets on major streets. This paper presents a new model that accounts for shared short lanes and thus delivers more realistic results for estimating the impedance effect of left turners. The new model can also deal with the effect of the so-called back-of-queue in reality. The presented theoretical concept can be extended to include the consequences of a short left-turn pocket on major streets and the corresponding capacities of the major streets with shared short lanes. Equations are derived for calculating the influence of the length of the left-turn pocket on the capacity of minor-street movements and on the probability of blockage to the through movement resulting from queued left-turn vehicles. Comprehensive simulation studies are conducted to confirm the derivation, and a general formula that considers both the short lane and back-of-queue is recommended for further applications. This formula will be incorporated into the upcoming edition of the HCM.

01323680

10-0482

English

pp 11-19

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160438

Print

Figures (8) ; References (8) ; Tables (2)

Highway capacity; Highway operations; Left turns; Traffic models; Traffic queuing; Traffic simulation; Unsignalized intersections

Highway Capacity Manual 2000

Two way stop controlled intersections

Highways; Operations and Traffic Management; I73: Traffic Control

TRIS, TRB, ATRI

Jan 25 2010 10:15AM

• Analysis of Left-Turn Saturation Flow Rates and Capacity at Signalized Intersections
• Assessing the Benefits of Incident Management Systems: Combining Freeway Facility Procedures from the "Highway Capacity Manual" and Data Archives of Intelligent Transportation Systems
• Categorizing Freeway Flow Conditions by Using Clustering Methods
• Consistency of Stochastic Capacity Estimations
• Control Delay at Signalized Diamond Interchanges Considering Internal Queue Spillback
• Differentiated Analysis of Level of Service F Within the German "Highway Capacity Manual"
• Empirical Analysis of Effects of Wait Time and Rain Intensity on Driver Left-Turn Gap Acceptance Behavior
• Estimating Performance on Two-Lane Highways: Case Study Validation of a New Methodology
• Estimating Sustained Service Rates at Signalized Intersections with Short Left-Turn Pockets: Mesoscopic Approach
• Impact of Left-Turn Spillover on Through Movement Discharge at Signalized Intersections
• Level of Service: 2010 and Beyond
• Modified Critical Movement Analysis Approach for Signalized Intersections
• Pedestrian Delay at Signalized Intersections with a Two-Stage Crossing Design
• Predicting Arrival Flow Profiles and Platoon Dispersion for Urban Street Segments
• Urban Street Performance: Level of Service and Quality of Progression Analysis