Evaluation Of Safety And Operational Effectiveness Of Dynamic Lane Merge System In Florida
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Evaluation Of Safety And Operational Effectiveness Of Dynamic Lane Merge System In Florida
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Author : Essam Radwan
language : en
Publisher:
Release Date : 2009
Evaluation Of Safety And Operational Effectiveness Of Dynamic Lane Merge System In Florida written by Essam Radwan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Intelligent transportation systems categories.
Mobility And Safety Evaluation Of Integrated Dynamic Merge And Speed Control Strategies In Work Zones
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Author : Syed Muhammad Zaier Abbas Zaidi
language : en
Publisher:
Release Date : 2010
Mobility And Safety Evaluation Of Integrated Dynamic Merge And Speed Control Strategies In Work Zones written by Syed Muhammad Zaier Abbas Zaidi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Intelligent transportation systems categories.
In recent years, there has been a considerable increase in the amount of construction work on the U.S. national highways. Most of the work undertaken is the reconstruction and rehabilitation of the existing transportation networks. Work zones in the United States are likely to increase in number, duration and length due to emphasis on repair and highway reconstruction as a significant portion of all federal-aid highway funds are now geared toward highway rehabilitation. The challenge of mobility is particularly acute in work zone areas as road repair and construction intensifies traffic issues and concentrates them in specific locations and at specific times. Due to the capacity drop, which is the result of lane closure in work zone area, congestion will occur with a high traffic demand. The congestion increases number and severity of traffic conflicts which raise the potential for accidents; furthermore traffic operational properties of roadway in work zone area become worse. Intelligent Transportation System (ITS) technologies have been developed and are being deployed to improve the safety and mobility of traffic in and around work zones. In several states in the US, the use of Dynamic Merge Controls also known as Dynamic Lane Merge (DLM) system has been initiated to enhance traffic safety and to improve traffic flow in work zone areas. The DLM usually takes two forms; dynamic early merge and dynamic late merge. The use of variable speed limit (VSL) systems at work zones is also one of those measures. VSL systems improve safety by helping the driver in determining the maximum speed that drivers should travel. Besides adding improvement to safety, they are also expected to improve mobility at the work zones. The main goal of this study is to evaluate the safety and operational effectiveness of the dynamic merge systems i.e. the dynamic early lane merge and dynamic late lane merge, in the presence of VSL system. More specifically, the VISSIM model is utilized to simulate a two-to-one lane configuration when one out of the two lanes in the work zone is closed for traffic. Six different scenarios were adopted to assess the effectiveness of these scenarios under different traffic demand volumes and different drivers' compliance rates to the messages displayed by the systems. These scenarios are; [bullet] Work Zone without VSL and without SDLMS or the current Motorist Awareness System (MAS) [bullet] Work Zone with VSL and without SDLMS [bullet] Work Zone with VSL and Early SDLMS [bullet] Work Zone with VSL and Late SDLMS [bullet] Work Zone with early SDLMS and without VSL [bullet] Work Zone with early SDLMS and without VSL An already calibrated and validated VISSIM model for Simplified Dynamic Lane Merge System (SDLMS) in accordance with the real life work zone was modified with a VSL through Vehicle Actuated Programming (VAP) code. Three different logics were coded each for VSL alone, early SDLMS+VSL and late SDLMS+VSL. All these logics were fine tuned with several test runs before finalizing it for the final simulation. It is found through the simulation of above mentioned scenarios that for low and medium volume levels (V0500, V1000 and V1500), there is no significant difference between the Maintenance of Traffic (MOT) plans for mean throughputs. However, for higher volume levels (V2000 and V2500), late SDLMS with and without VSL produced higher mean throughputs for all compliance rates and truck percentages except when the demand volume was 2,500 vph and compliance of 60%, where it produces the significantly lower mean throughputs. In terms of travel time through the work zone, results indicated that there is no significant difference between MOT types for demand levels of V0500 and V1000 when compliance is 40% or less but for compliance of 60% and more, only demand volume level that is not significantly different from other MOT types is V0500. This study revealed that VSL increases travel time through the work zone. This might be due to non-compliant vehicles that follow the compliant vehicle ahead unless they find a sufficient gap in adjacent lane to pass the compliant vehicle. It is also found out that VSL makes the system safer at higher volumes (2,000 vph and 2,500 vph). This was observed through safety surrogate measures selected for this study. Another outcome of this study is that the addition of VSL to the dynamic merge systems helps in improving the overall safety of the system by lowering speed variances and deceleration means of the vehicles travelling through the work zone. The passage of traffic through the work zone is made safer when a speed control is integrated to a dynamic merge system. It can be inferred from the simulation results that integrated SDLMS and VSL systems have better performance in terms of traffic mobility and safety than existing individual controls and also show that the integrated SDLMS and VSL system has more potential than each individual systems.
Safety And Operational Evaluation Of Dynamic Lane Merging In Work Zones
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Author : Rami Charles Harb
language : en
Publisher:
Release Date : 2009
Safety And Operational Evaluation Of Dynamic Lane Merging In Work Zones written by Rami Charles Harb and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Road work zones categories.
Results also showed that the dynamic late merge perform better than the MAS under volumes ranging between 1500 veh/hr and 2000 veh/hr and significantly poorer than the MAS under low volumes. Therefore, the late SDLMS is not recommended for implementation under low volumes. Results also showed that the late SDLMS performs better than the early SDLMS under higher volume (ranging between 1500 veh/hr to 2000 veh/hr). A simulated work zone with a two-to-one lane closure configuration was coded in VISSIM and operational and safety MOEs under MAS, early SDLMS, and late SDLMS were compared under different drivers' adherence rate to the merging instructions, truck percentage in the traffic composition, and traffic demand volumes. Results indicated that throughputs are higher in general under the early SDLMS, travel times are lower under the early SDLMS. However, overall, the early SDLMS resulted in the highest speed variance among MOT types. The MAS resulted in the lowest speed variances overall.
Annual Report
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Author :
language : en
Publisher:
Release Date :
Annual Report written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Transportation categories.
Integrated Work Zone Safety Management System And Analysis Tools
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Author : Jian John Lu
language : en
Publisher:
Release Date : 2008
Integrated Work Zone Safety Management System And Analysis Tools written by Jian John Lu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with CD-ROMs categories.
Highway Safety Literature
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Author :
language : en
Publisher:
Release Date : 1979
Highway Safety Literature written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Automobiles categories.
Potential Connected Vehicle Applications To Enhance Mobility Safety And Environmental Security
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Author : Xiaosi Zeng
language : en
Publisher:
Release Date : 2012
Potential Connected Vehicle Applications To Enhance Mobility Safety And Environmental Security written by Xiaosi Zeng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Intelligent transportation systems categories.
Announcement Of Highway Safety Literature
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Author :
language : en
Publisher:
Release Date : 1979
Announcement Of Highway Safety Literature written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with Traffic accidents categories.
Intelligent Transportation Systems Benefits Costs Deployment And Lessons Learned
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Author :
language : en
Publisher:
Release Date : 2008
Intelligent Transportation Systems Benefits Costs Deployment And Lessons Learned written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Electronic traffic controls categories.
"Intelligent transportation systems (ITS) provide a proven set of strategies for addressing the challenges of assuring safety and reducing congestion, while accommodating the growth in transit ridership and freight movement. This report presents information on the performance of deployed ITS under each of these goal areas, as well as information on the costs, deployment levels, and lessons learned regarding ITS deployment and operations. The report, and the collection of four Web-based resources upon which it is based, have been developed by the U.S. DOT's ITS Joint Program Office (JPO) to support informed decision making regarding ITS deployment. This report discusses 17 different areas of ITS application. These chapters are divided into two sections discussing technologies deployed on the transportation infrastructure and those deployed within vehicles. The 14 different infrastructure applications discussed can be grouped into ITS strategies applied to roadways, transit, management and operations of transportation systems, and freight movement. Lessons learned during ITS planning implementation and deployment, are highlighted throughout the report and in a chapter following the review of ITS applications."--Technical report documentation page.
Human Factors Guidelines For Road Systems
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Author : National Cooperative Highway Research Program
language : en
Publisher:
Release Date : 2010
Human Factors Guidelines For Road Systems written by National Cooperative Highway Research Program and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.
This report contains guidelines that provide human factors principles and findings for consideration by highway designers and traffic engineers. The guidelines allow the non-expert in human factors to more effectively consider the roadway user's capabilities and limitations in the design and operation of highway facilities. The following chapters are included in collection C: (16) Special Considerations for Rural Environments; (17) Speed Perception, Speed Choice, and Speed Control; (18) Signing; (19) Changeable Message Signs; (20) Markings; (22) Tutorials (Tutorials 4, 5, 6); (23) References (Updated); (24) Glossary; (25) Index; and (26) Abbreviations (Updated).