Evaluation Of Temporary Ramp Metering For Work Zones
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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.
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.
Evaluation Of Ramp Meter Effectiveness For Wisconsin Freeways
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Author :
language : en
Publisher:
Release Date : 2004
Evaluation Of Ramp Meter Effectiveness For Wisconsin Freeways 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 Express highway interchanges categories.
Identification And Evaluation Of The Cost Effectiveness Of Highway Design Features To Reduce Nonrecurrent Congestion
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Author : Ingrid B. Potts, Douglas W. Harwood, Jessica M. Hutton, Chris A. Fees, Karin M. Bauer, Lindsay M. Lucas, Christopher S. Kinzel and Robert J. Frazier
language : en
Publisher: Transportation Research Board
Release Date :
Identification And Evaluation Of The Cost Effectiveness Of Highway Design Features To Reduce Nonrecurrent Congestion written by Ingrid B. Potts, Douglas W. Harwood, Jessica M. Hutton, Chris A. Fees, Karin M. Bauer, Lindsay M. Lucas, Christopher S. Kinzel and Robert J. Frazier 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 with categories.
This report from the second Strategic Highway Research Program (SHRP 2), which is administered by the Transportation Research Board of the National Academies, focuses on geometric design treatments that can be used to reduce delays due to nonrecurrent congestion.
Evaluation Of Mobility Impacts Of Temporary Ramp Metering In Work Zones
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Author : Naghma Hassan
language : en
Publisher:
Release Date : 2012
Evaluation Of Mobility Impacts Of Temporary Ramp Metering In Work Zones written by Naghma Hassan 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.
Road maintenance has been growing in the United States and brings a variety of challenges to the transportation profession. Work zone congestion is one of the most important factors contributing to the delay and safety of freeways. Many control methodologies have been applied to work zones in order to reduce freeway congestion and delay. One means of control is ramp metering, which has been deployed since 1963 in the United States and has proven to be successful. This thesis' objective is to evaluate and simulate the effect of ramp metering on freeway work zones; traffic performance measures such as delay, speed, and number of stops are used for the evaluation. A literature review showed that a main factor contributing to the freeway work zone delay is a high percentage of commercial trucks. Due to the role of truck percentage in work zone performance, effectiveness of ramp metering in work zone control is evaluated with different truck percentages. The lane configuration for all the studied sites work zones was 2 lanes to 1 lane, because it's frequency in real-world applications. In the evaluation of ramp metering in work zones, the traffic volumes investigated were less than, equal to, and more than capacity (650vph, 1240vph, and 1854vph). Mainline (a link used for trough traffic) truck percentage and ramp truck percentage varied from 10% to 40%, and 10% to 20%, respectively. As a result, a total of 8 cases were created and simulated using VISSIM traffic simulation software.
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.
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.
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.
Evaluating Alternative Operations Strategies To Improve Travel Time Reliability
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Author : National Academies of Sciences, Engineering, and Medicine (U.S.)
language : en
Publisher: Transportation Research Board
Release Date : 2022-03-29
Evaluating Alternative Operations Strategies To Improve Travel Time Reliability written by National Academies of Sciences, Engineering, and Medicine (U.S.) 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 2022-03-29 with Business & Economics categories.
This report from the second Strategic Highway Research Program (SHRP 2), which is administered by the Transportation Research Board of the National Academies, sets out requirements for travel time reliability within a performance-based planning process. The research includes an effort to determine the economic value of improvements in travel time reliability by applying options theory from the financial sector. The report includes two succinct tables that describe requirements for person and freight trips for reliable transport, as well as a forecast of the year 2030 under alternative assumptions that may influence travel time reliability.
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.