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Safety evaluation of work zone including its technologies using stochastic micro-simulation
National Highway Authority, Pakistan.
University of Central Florida.
University of Central Florida.
2013 (English)In: Proceedings of the 16th International Conference Road Safety on Four Continents: Beijing, China. 15-17 May 2013, Linköping: Statens väg- och transportforskningsinstitut, 2013Conference paper (Other academic)
Abstract [en]

In recent years, there has been a considerable increase in the amount of construction work on the U.S. national highways, resulting in lane closure in work zone area, causing congestion with a high traffic demand. ITS-based technology such as dynamic lane merging and variable speed limits were adopted by several states to enhance both safety and mobility of roadway work zones. Dynamic lane merging (DLM) in its two main forms namely the early merge and the late merge was designed to advise drivers on definite merging locations. Variable speed limits (VSL) were introduced to work zones to decrease speed fluctuations and to smoothen traffic through work zones. Up to date, there are no studies that contrast standalone or a combination of ITS technologies to standard work zones under matching work zone settings. This study simulates a two-to-one work zone lane closure configuration in VISSIM under six different Maintenance of Traffic (MOT) plans. The first MOT consisted of the conventional plans used in Florida work zones, the second MOT consisted of a simplified dynamic early merging system (early SDLMS), the third MOT consisted of a simplified dynamic late merging systems (late SDLMS), the fourth MOT consisted appending a VSL to the conventional Florida MOT, the fifth MOT consisted of adding a VSL to the early SDLMS, and the sixth MOT consisted of adding a VSL to the late SDLMS. From the safety point of view, early and late SDLMS performed poorly as compared to VSL and Motorist Awareness System (MAS) when higher volumes were involved, but the addition of VSL improved their safety aspect by decreasing the speed variance of the vehicles traveling in both open and a closed lane. It was concluded that the passage of traffic through a work zone is made safer when a speed control is integrated to a dynamic merge system.

Place, publisher, year, edition, pages
Linköping: Statens väg- och transportforskningsinstitut, 2013.
Keyword [en]
Work zone, Safety, Merging traffic, Traffic lane, Dynamics, Variable speed limit, Traffic flow, Simulation
National Category
Infrastructure Engineering
Research subject
X RSXC; 30 Road: Highway design, 34 Road: Safety devices; 20 Road: Traffic engineering, 23 Road: ITS och traffic
URN: urn:nbn:se:vti:diva-7382OAI: diva2:759736
16th International Conference Road Safety on Four Continents. Beijing, China (RS4C 2013). 15-17 May 2013
Available from: 2014-10-31 Created: 2014-10-31 Last updated: 2014-11-06Bibliographically approved

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