An Evaluation Of The Impacts Of Changeable Message Signs On Freeway Diversion
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An Evaluation Of The Impacts Of Changeable Message Signs On Freeway Diversion
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Author : Bellandra Benefield Foster
language : en
Publisher:
Release Date : 1999
An Evaluation Of The Impacts Of Changeable Message Signs On Freeway Diversion written by Bellandra Benefield Foster and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Express highways categories.
Evaluation Of Dynamic Message Signs And Their Potential Impact On Traffic Flow
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Author : Ali Ebadollahzadeh Haghani
language : en
Publisher:
Release Date : 2013
Evaluation Of Dynamic Message Signs And Their Potential Impact On Traffic Flow written by Ali Ebadollahzadeh Haghani and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Traffic flow categories.
Maryland State Highway Administration (SHA) has a rich data archive of the messages posted to the Dynamic Message Signs (DMS) and the time stamps when they were posted and taken down. The archive also contains traffic information surrounding the DMS signs, such as traffic volumes and speeds from various point or probe-based sensors. In this project, the research team used this data archive to study the impact of DMS messages on traffic conditions. Multiple Bluetooth sensors were deployed on a major travel corridor in the Baltimore Metropolitan Area to determine vehicle travel times and to monitor traffic diversions.
Evaluation Of Variable Message Signs In Managing Freeway Incidents Using Simulation
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Author : Jeff Gerard Gerken
language : en
Publisher:
Release Date : 1998
Evaluation Of Variable Message Signs In Managing Freeway Incidents Using Simulation written by Jeff Gerard Gerken 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.
The diversion decision process was used to determine the timing of traffic diversion and signal timing alterations on the diversion routes in an effort to reduce total network delay. A case study was used to evaluate the effectiveness of VMS compared to a baseline scenario and other diversion decisions based on experience. For the case study used, VMS reduced total delay by 21 percent over baseline conditions and 17 percent reduction in total delay compared to other diversion decision processes.
Changeable Message Sign Displays During Non Incident Non Roadwork Periods
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Author : Conrad L. Dudek
language : en
Publisher: Transportation Research Board
Release Date : 2008
Changeable Message Sign Displays During Non Incident Non Roadwork Periods written by Conrad L. Dudek 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 2008 with Electronic traffic controls categories.
Evaluation Of Driver Reactions For Effective Use Of Dynamic Message Signs In Richmond Virginia
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Author : Jeremy L. Schroeder
language : en
Publisher:
Release Date : 2010
Evaluation Of Driver Reactions For Effective Use Of Dynamic Message Signs In Richmond Virginia written by Jeremy L. Schroeder and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Variable message signs categories.
Dynamic message signs (DMS) are used in conjunction with other media to communicate traffic conditions, general information, and recommended diversion strategies to motorists. Previous studies using loop detector data to estimate diversion rates attributable to advisory messages on DMS have found that diversion is minimal when vague messages are displayed or a distant alternate route is the only option. For motorists traveling on I-95 through Richmond in the Virginia Department of Transportation's Central Region, however, when DMS alert motorists of incidents, I-295 serves as a comparable alternate route, adding no significant travel time to through trips. This scenario provides the opportunity to evaluate the effectiveness of DMS in traffic diversion without the major concerns of added trip time and the quality of the route. This study investigated the impacts of existing message strategies to determine messages that maximize diversion for specific circumstances and to develop new messages for future deployment. An analysis was done for various message types and split into two diversion scenarios: (1) an incident on the primary freeway, I-95, encourages diversion of I-95 traffic to an alternate route, I-295; and (2) an incident on an intersecting freeway, I-295, encourages exiting I-295 traffic to remain on I-95 as an alternate route. The results showed trends where the use of particular words in messages is more effective than the use of others in achieving diversion when percentage of diverted traffic was used as the performance measure. The effects on traffic flow by drivers' reactions to non-traffic messages were also investigated. Transportation agencies are frequently asked to post public service announcements on DMS when they are not being used for traffic-related purposes. It has been suggested that these messages are a distraction to drivers and result in queuing, creating mobility and safety hazards. An analysis that used speed as the performance measure showed minimal impacts on traffic flow from the display of non-traffic messages during weekday non-peak hours. The study recommends that (1) travel time estimates for both the primary and alternate routes or the length or time of the delay be provided on DMS; (2) specific wording, as noted in the text, be used to induce diversion or simply to provide information; (3) messages be displayed in "title case" instead of "ALL CAPS" (i.e., all letters in a word are capitalized) for low-frequency messages; and (4) left-justified or "staircase" messages be used. Further, non-traffic messages should be one-phase messages and should be displayed only during non-peak periods to minimize the potential for queuing. If the recommendations of this research are implemented, the enhanced effectiveness of diversion strategies will result in reductions of delay, fuel consumption, and emissions, as well as the potential for secondary accidents created by major incidents and other traffic flow disruptions. In 2007, the cost of delay for motorists in Richmond, Virginia, resulting from incidents was estimated at $119 million. A modest 1 percent reduction in this cost attributable to better diversion strategies that use DMS more effectively would result in an annual cost savings to VDOT of more than $1 million.
An Analysis Of Cms Impact On Incident Based Congestion
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Author : In-Kyu Lim
language : en
Publisher:
Release Date : 2005
An Analysis Of Cms Impact On Incident Based Congestion written by In-Kyu Lim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Express highways categories.
Report No Fhwa Rd
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Author : United States. Federal Highway Administration. Offices of Research and Development
language : en
Publisher:
Release Date : 1977
Report No Fhwa Rd written by United States. Federal Highway Administration. Offices of Research and Development and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Real Time Evaluation Of Changeable Message Sign Impacts
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Author : Yu Cheng
language : en
Publisher:
Release Date : 2001
Real Time Evaluation Of Changeable Message Sign Impacts written by Yu Cheng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
A Planning Model For Optimizing Locations Of Changeable Message Signs Electronic Resource
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Author : Jeffrey M. Henderson
language : en
Publisher: University of Waterloo
Release Date : 2004
A Planning Model For Optimizing Locations Of Changeable Message Signs Electronic Resource written by Jeffrey M. Henderson and has been published by University of Waterloo this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
Changeable Message Signs (CMS) are commonly utilized by transportation agencies to inform motorists of traffic, roadway, and environmental conditions. They may be used to provide information, such as delay and alternate route guidance, in the event of an incident, construction or a roadway closure. The effectiveness of CMS in managing freeway traffic, however, is a function of many factors including the number of CMS installations, the location of CMS, the messages displayed, varied traffic network characteristics, and drivers' response to incident conditions and CMS information. The objective of this thesis is to develop a CMS location planning model that can be used by transportation agencies to develop a CMS location plan that could achieve the largest long-term benefit to the system. This research is mainly motivated by the lack of systematic, robust and practical methods for locating CMS. State-of-practice methods rely mostly on the practitioner's experience and judgement. Other methods fail to incorporate reasonable driver behaviour models, consider time-varying demand, allow for computational efficiency on large networks, or consider the spatial variation of incidents on a traffic network. A new CMS location optimization model has been developed that is unique in both model realism and computational efficiency. The model incorporates several components to estimate incident delay, predict driver response, estimate network-wide benefit, and choose those CMS locations that would provide the most benefit. Deterministic queuing methods are used in conjunction with historic incident characteristics to approximate the delay impact of an incident with and without CMS. A discrete choice model is used to predict the rate at which drivers would switch from the incident route to a less congested alternative under CMS information. A network traffic assignment model is then incorporated in an attempt to estimate the resulting traffic induced by incidents. Genetic algorithms are utilized as an optimization technique to choose a set of CMS that would provide the most benefit. An extensive computational analysis was performed on both a hypothetical network and a segment of Highway 401 through Toronto. A sensitivity analysis was performed to test the model's response to parameter and data estimation errors. The model was found to be most sensitive to the diversion model parameters. The model produced reasonable results with locations selected upstream of major freeway interchange diversion points. Considering the additional components included in the proposed model, and its ability to consider more location schemes, the proposed model may be considered superior to previous CMS location models.
Evaluation Of A Changeable Message Sign System On The Inbound Gulf Freeway Final Report
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Author : William R. Stockton
language : en
Publisher:
Release Date : 1975
Evaluation Of A Changeable Message Sign System On The Inbound Gulf Freeway Final Report written by William R. Stockton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1975 with Express highways categories.