Abstract
Traffic control is very important for two-lane highway lane-closure work zone traffic management. Control of the open lane’s right of way is very similar to that of a two-phase signalized intersection. Thus, four control strategies including flagger control, pre-timed control proposed by Schonfeld, pre-timed control proposed by Webster, and actuated control are employed for possible use at work zones. Two primary methodologies, the mathematical delay model adopted from signalized intersections, and the simulation model calibrated with field data, are proposed. The simulation and mathematical results show that control strategies for two one-way road intersections could be used for two-lane highway lane-closure work zones. Flagger control after gap-out distance optimization prevails over all the other control strategies in terms of stopped delay, queue length, and throughput, under low or high volumes. Actuated control could be a good alternative for work zone areas due to its small queue length and large vehicle throughput under moderate volume conditions. Our findings may help to optimize the work-zone control strategy and improve operational efficiency at two-lane highway lane-closure work zones.
Highlights
A work zone is a section of roadway with construction, maintenance, or utility work activities [1]
UNnodteerthLaotwwhvoenlutmhee vehicle inputs are close to or even exceed the capacity of two-lane highway work zones, the control plans generated by both flagger control Compared with pre-timed control (Webster and Schonfeld), flagger control and actuated control show an advantage with respect to the average stopped delay, queue length, and vehicle throughput
This paper aimed to find better control strategies for two-lane highway lane-closure work zones with optimal average stopped delay, queue length, and vehicle throughput
Summary
A work zone is a section of roadway with construction, maintenance, or utility work activities [1]. For two-lane highway work zones, a single lane closure has quite different implications. How to further improve control strategies for two-lane highway work zones to optimize traffic condition indicators, such as reducing delay and queue length, has not been well discussed. How two-lane work zone volume and speed limit affect delay, queue length, and throughput is not clearly stated as well. A mathematical model for delay calculation and a simulation model for control strategies comparison and optimization were proposed.
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