Evaluation Of Temporary Ramp Metering For Work Zone Safety
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Evaluation Of Temporary Ramp Metering For Work Zone Safety
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Author : Zhongyuan Zhu
language : en
Publisher:
Release Date : 2012
Evaluation Of Temporary Ramp Metering For Work Zone Safety written by Zhongyuan Zhu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
Ramp metering has been successfully implemented in many states and studies have documented its positive mobility and safety benefits. However, there have been no studies on the use of ramp metering for work zones. This thesis reports the results from the first deployment of temporary ramp meters in work zones in the United States. Temporary ramp meters were deployed at seven work zones in Missouri. Due to lack of crash data, this study uses video data to extract alternative safety measures such as driver compliance, merging behavior, speed differentials, lane changing, and braking maneuvers. This evaluation suggests that temporary ramp meters should only be deployed at work zone locations where there is potential for congestion and turned on only during periods of high congestion. In comparison to over 90% compliance rates of permanent ramp meters implemented in other states, field data showed compliance rates from 40.5% to 82.9% in temporary ramp meter. This suggested that non-compliance could be a major safety issue in the deployment of temporary ramp meters. The use of a three-section instead of a traditional two-section signal head used for ramp metering produced significantly higher compliance rates. This thesis then aggregated the data into groups to further analyze the effects of different factors such as platoons, commercial trucks, work zone type and work zone-ramp configuration. After analyzing general characteristics of mainline and ramp vehicle speed and speed differentials, this study then focused on findings for different comparison groups. The two comparison groups are "between two work zones" versus "before work zone" configuration and "left-lane closed" versus "right-lane closed" work zone type. Results indicated lower mean speeds of mainline and ramp vehicles and higher differentials when ramp metering was turned on. This is expected and again temporary ramp meters are recommended only where congestion occurs. Congestion will lead to lower mainline speeds thus lower speed differentials either with or without ramp metering. Finally, analysis of merging headways showed that temporary ramp meters were effective in separating platoons before vehicles merged into mainline. This produces more single-vehicle merging which requires shorter gaps and causes fewer impacts on the mainline traffic.
Ca 101 Cuesta Grade Highway Improvements 1 1 Miles North Of Reservoir Canyon Road To The Cuesta Grade Overhead San Luis Obispo County
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Author :
language : en
Publisher:
Release Date : 1998
Ca 101 Cuesta Grade Highway Improvements 1 1 Miles North Of Reservoir Canyon Road To The Cuesta Grade Overhead San Luis Obispo County written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
Work Zone Operations
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Author :
language : en
Publisher: DIANE Publishing
Release Date : 2000
Work Zone Operations written by and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Evaluation Of Temporary Ramp Metering For Work Zones
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Author : Praveen Edara
language : en
Publisher:
Release Date : 2012
Evaluation Of Temporary Ramp Metering For Work Zones written by Praveen Edara and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Traffic safety categories.
Ramp metering has been successfully implemented in many states to improve traffic operations on freeways. Studies have documented the positive mobility and safety benefits of ramp metering. However, there have been no studies on the use of ramp metering for work zones. This report documents the results from the first deployment of temporary ramp meters in work zones in the United States. Temporary ramp meters were deployed at seven urban short-term work zones in Missouri. Safety measures such as driver compliance, merging behavior, and speed differentials were extracted from video-based field data. Mobility analysis was conducted using a calibrated simulation model and the total delays were obtained for under capacity, at capacity, and over capacity conditions. This evaluation suggests that temporary ramp meters should only be deployed at work zone locations where there is potential for congestion and turned on only during above-capacity conditions. The compliance analysis showed that non-compliance could be a major safety issue in the deployment of temporary ramp meters for under-capacity conditions. The use of a three-section instead of a traditional two-section signal head used for permanent ramp metering produced significantly higher compliance rates. Ramp metering decreased ramp platoons by increasing the percentage of single-vehicle merges to over 70% from under 50%. The accepted-merge-headway results were not statistically significant even though a slight shift towards longer headways was found with the use of ramp meters. Mobility analysis revealed that ramp metering produced delay savings for both mainline and ramp vehicles for work zones operating above capacity. On average a 24% decrease in total delay (mainline plus ramp) at low truck percentage and a 19% decrease in delay at high truck percentage conditions resulted from ramp metering.
State Highway Plan Global Evaluation
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Author :
language : en
Publisher:
Release Date : 1997
State Highway Plan Global Evaluation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Highway planning categories.
Development Of Methods For Benefits Assessment Of Its Deployment In Wisconsin
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Author :
language : en
Publisher:
Release Date : 2004
Development Of Methods For Benefits Assessment Of Its Deployment In Wisconsin written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Intelligent transportation systems categories.
Guidelines For Developing Transportation Management Plans In Virginia
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Author : Benjamin H. Cottrell
language : en
Publisher:
Release Date : 2005
Guidelines For Developing Transportation Management Plans In Virginia written by Benjamin H. Cottrell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Roads categories.
A transportation management plan (TMP) is a comprehensive program of traffic control, communication, operation, and demand management strategies designed to maintain acceptable levels of traffic flow in work zones. A systematic procedure and/or checklist is needed for developing plans to lessen the impact of construction projects that restore or improve highways. The purpose of this research was to establish guidelines for developing TMPs for construction projects. Three questions were addressed by the guidelines: When should a TMP be developed? How should a TMP be developed? What should be in a TMP? The Federal Highway Administration published the Final Rule on Work Zone Safety and Mobility on September 9, 2004. It facilitates the comprehensive consideration of the broader safety and mobility impacts of work zones across project development stages and the adoption of additional strategies including TMPs that help manage these impacts during project implementation. Guidelines for TMPs were derived from a draft implementation guide for the final rule with minor revisions. TMPs may consist of up to three components: (1) a temporary traffic control plan that describes traffic control measures used to facilitate road users through a work zone; (2) transportation operations strategies that will be used to ease work zone impacts; and (3) public information strategies to inform those affected by the project of the expected work zone impacts and changing conditions. At a minimum, each TMP should have a temporary traffic control plan. It is recommended that the Virginia Department of Transportation implement the guidelines developed in this study.
Detector Technology Evaluation
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Author : Peter T. Martin
language : en
Publisher:
Release Date : 2003
Detector Technology Evaluation written by Peter T. Martin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Detectors categories.
A Review Of Traffic Congestion Trends And Related Mitigation Efforts
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Author : Pennsylvania. General Assembly. Legislative Budget and Finance Committee
language : en
Publisher:
Release Date : 2001
A Review Of Traffic Congestion Trends And Related Mitigation Efforts written by Pennsylvania. General Assembly. Legislative Budget and Finance Committee and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Land use categories.
Human Factors Guidelines For Road Systems
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Author : John L. Campbell
language : en
Publisher: Transportation Research Board
Release Date : 2012
Human Factors Guidelines For Road Systems written by John L. Campbell and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Technology & Engineering categories.
"This report completes and updates the first edition of NCHRP Report 600: Human Factors Guidelines for Road Systems (HFG), which was published previously in three collections. The HFG contains guidelines that provide human factors principles and findings for consideration by, and is a resource document for, highway designers, traffic engineers, and other safety practitioners."--Foreword.