01477015

Component

https://doi.org/10.3141/2355-06

http://scholar.google.com...Yang&publication_year=2013

Many congested intersections have a heavy traffic volume on movements for which capacity is insufficient because of geometric limitations. An unconventional approach that increases the capacity of heavily congested intersections is presented: this approach opens up exit lanes for left-turn traffic dynamically with the help of an additional traffic light installed at the median opening (the presignal); this situation is referred to as exit lanes for left-turn (EFL) control. An optimization problem for EFL control was formulated as a mixed-integer nonlinear program, in which the geometric layout, main signal timing, and presignal timing were integrated. The mixed-integer nonlinear program was solved by transformation into a series of mixed-integer linear programs. The latter problem can be solved with the standard branch-and-bound technique. The results of extensive numerical analysis and VISSIM simulation showed that the EFL approach could increase intersection capacity and reduce traffic delay substantially, especially under high left-turn demand. Moreover, the EFL control can be applied to one or multiple legs simultaneously; thus the control is particularly useful for intersections with an unbalanced left demand and a degree of saturation in travel directions.

01495450

13-2989

English

pp 49-59

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309286725

Print

Figures (6) ; References (26) ; Tables (6)

Capacity restraint; Highway capacity; Left turn lanes; Left turns; Mixed integer programming; Signalized intersections; Traffic congestion; Traffic delays; Traffic signal timing; Traffic volume

VISSIM (Computer model)

Highways; Operations and Traffic Management; Safety and Human Factors; I73: Traffic Control

TRIS, TRB, ATRI

Feb 5 2013 12:36PM

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• Probability Model for Understanding the Effects of Detector Delays on Right-Turn-on-Red Traffic
• Revisiting the Cycle Length: Lost Time Question with Critical Lane Analysis
• Simple Methodology for Estimating Queue Lengths at Signalized Intersections Using Detector Data
• Traffic Signal Timing Optimization: Choosing the Objective Function
• Two-Step Optimization Model for Dynamic Lane Assignment at Isolated Signalized Intersections