Efficacy Of Speed Monitoring Displays In Increasing Speed Limit Compliance In Highway Work Zones
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Efficacy Of Speed Monitoring Displays In Increasing Speed Limit Compliance In Highway Work Zones
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Author : Jeanne Marie Bowie
language : en
Publisher:
Release Date : 2003
Efficacy Of Speed Monitoring Displays In Increasing Speed Limit Compliance In Highway Work Zones written by Jeanne Marie Bowie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic dissertations categories.
Researchers are looking at several mechanisms for improving safety in highway work zones, including lowering the mean speed of vehicles in the work zone, encouraging drivers to be alert in work zones, improving the control of traffic in merging areas, and improving the safety devices that separate vehicles and construction workers. This study focuses on the goal of reducing speed in work zones.
Efficacy Of Speed Monitoring Displays In Increasing Speed Limit Compliance In Highway Work Zones
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Author : Jeanne Marie Bowie
language : en
Publisher:
Release Date : 2003
Efficacy Of Speed Monitoring Displays In Increasing Speed Limit Compliance In Highway Work Zones written by Jeanne Marie Bowie and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic dissertations categories.
First, methods of speed reduction used by state DOTs throughout the country are identified, and the research surrounding them is summarized. Next, the methodology and results of a field study that tests the efficacy of the Speed Monitoring Display (SMD) are described in detail. Finally, the results of a survey that was conducted to ascertain drivers2 opinions of the SMD are presented.
Use Of Speed Monitoring And Communications Display For Traffic Control
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Author : Jon Michael Wertjes
language : en
Publisher: DIANE Publishing
Release Date : 1996
Use Of Speed Monitoring And Communications Display For Traffic Control written by Jon Michael Wertjes and has been published by DIANE Publishing this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Roads categories.
A research report to identify or develop a speed monitoring display suitable for use in interstate highway work zones, & evaluate the display's effectiveness in reducing speeds in interstate work zones. A review of the literature & current practice was conducted to identify product availability & other state transportation use. Speed monitoring display alternatives were identified & evaluated according to essential requirements & project evaluation criteria. A lidar laser radar device was tested with a changeable message sign. The speed monitoring display was effective in reducing speeds higher than 70 mph.
Evaluation Of Traffic Control Countermeasures To Improve Speed Limit Compliance In Work Zones On High Speed Roadways
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Author : Daniel D. Mason
language : en
Publisher:
Release Date : 2013
Evaluation Of Traffic Control Countermeasures To Improve Speed Limit Compliance In Work Zones On High Speed Roadways written by Daniel D. Mason and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Road work zones categories.
"Slowing motorists within work zones on high-speed roadways continues to be a challenge for highway operators in all jurisdictions. The New Brunswick Department of Transportation and Infrastructure (NBDTI) utilizes procedures outlined in the Work Area Traffic Control Manual (WATCM) to manage speeds within work zones. The WATCM states the posted limit in work zones may not be more than 20 km/h less than the prevailing posted limit due to previous research indicating a larger reduction will increase the risk of collision. Workers on high-speed facilities are exposed to speeds of 90 km/h and greater. This study aims to identify traffic control countermeasures that will allow a further reduction below 90 km/h while maintaining speed limit compliance. The countermeasures tested included each, as well as combinations, of the following: Floating Speed Zones (FSZ); Traffic Control Person (TCP); Narrow Lanes; Radar Speed Display Board (RSDB); Variable Message Sign (VMS); Fake Police Vehicle. The top ranked countermeasures in terms of speed reduction were found to be the following combinations: the TCP and the FSZ; the Fake Police Vehicle and the FSZ; and the RSDB and the FSZ. The TCP/ FSZ, Fake Police Vehicle/ FSZ and the RSDB/ FSZ resulted in mean speed reductions of 23 km/h, 19 km/h and 19 km/h, respectively. Implementation of the countermeasures did not significantly increase speed variance. It is recommended that NBDTI incorporate a provision within the WATCM to allow reductions to 70 km/h as long as a RSDB or a TCP is used as a supplemental countermeasure."--Page ii.
Effectiveness Of Changeable Message Signs In Controlling Vehicle Speeds In Work Zones
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Author : Nicholas J. Garber
language : en
Publisher:
Release Date : 1994
Effectiveness Of Changeable Message Signs In Controlling Vehicle Speeds In Work Zones written by Nicholas J. Garber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Roads categories.
Work zone speeds have customarily been regulated by standard regulatory or advisory speed signs. However, most drivers do not slow down in response to these static speed control measures. The changeable message sign (CMS) with radar unit has dynamic capabilities which may be more effective in altering driver behavior. The radar, attached directly to the CMS, determines the actual speed of individual vehicles in the traffic stream. Upon detecting a speed higher than a preset threshold limit, the CMS can display a personalized warning message. This study evaluated the effectiveness of the CMS with radar unit in reducing work zone speeds. Four CMS messages designed to warn drivers that their speed exceeded the maximum safe speed were tested at seven work zones on two interstate highways in Virginia. Speed and volume data for the whole population traveling through the work zone were collected with automatic traffic counters. To assess the effect of CMS on high-speed drivers in particular, vehicles that triggered the radar-activated display were videotaped as they passed through the work zone. Using the data obtained from the traffic counters and videotapes, speed characteristics were determined at the beginning, middle, and end of the work zone. These characteristics were computed for the whole population and for high-speed vehicles separately. Statistical tests were then conducted using these speed characteristics to determine whether significant reductions in speed accompanied the use of CMS. Odds ratios were first calculated to compare the odds for speeding when using CMS with the odds for speeding when using the Manual on Uniform Traffic Control Devices (MUTCD) signing only. These odds ratios indicated that CMS effectively reduced the number of vehicles speeding by any amount, by 5 mph or more, and by 10 mph or more in the work zone. When analysis of variance was used to compare speeds when using the CMS with speeds when using MUTCD signing only, all of the speed characteristics average speeds, 85th percentile speeds, speed variance, and the percentage of vehicles speeding by any amount, by 5 mph or more, and by 10 mph or more were reduced with any of the four CMS messages. In some cases, these reductions were not significant at a= 0.05. The messages were rated according to their level of effectiveness in the following order: [1] YOU ARE SPEEDING SLOW DOWN, [2] HIGH SPEED SLOW DOWN, [3] REDUCE SPEED IN WORK ZONE, and [4] EXCESSIVE SPEED SLOW DOWN. Finally, t tests were conducted using the speed data obtained for the high-speed vehicles, and at a significance level of ct 0.05, all of the messages were effective in significantly reducing the average speeds of those vehicles traveling 59 mph or faster in a 55 mph work zone when compared to MUTCD signing only.
Effectiveness Of Changeable Message Signs In Controlling Vehicle Speeds In Work Zones
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Author : Nicholas J. Garber
language : en
Publisher:
Release Date : 1998
Effectiveness Of Changeable Message Signs In Controlling Vehicle Speeds In Work Zones written by Nicholas J. Garber and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Roads categories.
Highway work zones have been plagued with increasing numbers of accidents in recent years. Drivers' lack of compliance with speed restrictions within work zones has been cited as one of the major contributing factors to this trend. The conventional practice for regulating work zone speeds has been static signing procedures (using regulatory or advisory speed signs). It has been found that drivers do not slow down in response to these static control measures. Changeable message signs (CMS) equipped with a radar unit can be used to display specific warning messages to speeding drivers. The radar unit detects the speed of each vehicle entering the work zone and can be programmed to activate the CMS if the speed of the vehicle exceeds a preset threshold value. This offers a more dynamic speed control environment and therefore may prove to be more effective in influencing drivers to reduce their speeds. This report is the second phase of a longitudinal research study. The first phase of the project, conducted by Garber and Patel, examined the short term effectiveness of CMS in reducing vehicle speeds in work zones. That research established that the CMS (with the radar unit) is more effective in reducing speeds in work zones than the standard Manual on Uniform Traffic Control Devices (MUTCD) signs. This study, while attempting to replicate the results obtained in phase I of the project, concentrated on evaluating the effect of duration of exposure of the CMS with radar on its effectiveness in reducing speeds and influencing speed profiles in work zones. The impact of length of the work zone and vehicle type on speed reductions was also studied. Three work zone sites in southwest Virginia, two on Interstate 81 and one on a primary highway on Route 19, were selected for the study. Speed and volume data for the population were collected using automatic traffic counters at the beginning, middle and end of each work zone. In addition, the speeds of individual drivers who triggered the CMS by exceeding the threshold speed were also recorded (using a video camera) at two other locations within the work zone to study the behavior of high speed drivers in particular and to compute their average speed reduction in response to the warning message. The results of the study indicate that the duration of exposure of the CMS does not have a significant impact on speed characteristics and driver behavior. Therefore, the CMS continues to be effective in controlling speeds in work zones for projects of long duration. It was also determined that the drivers exceeding the speed limit, in both interstate work zones have on average reduced their speeds by around 12.86 km/h (8 mph) at the middle of the work zone. At the third site (Route 19) the speed reductions at the middle of the work zone were about 16.08 km/h (10 mph). It was also found that there were no distinctive differences among the different types of vehicles with regard to speed reduction. The study also established that in longer work zones, drivers who reduced their speeds in response to the speed control effort frequently have a tendency to speed back up as they approach the end of the work zone. This indicates that very long work zones might warrant the installation of a second CMS to maintain speed reductions through the work zone.
Identification And Testing Of Measures To Improve Work Zone Speed Limit Compliance
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Author : Marcus A. Brewer
language : en
Publisher:
Release Date : 2005
Identification And Testing Of Measures To Improve Work Zone Speed Limit Compliance written by Marcus A. Brewer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with Road work zones categories.
Evaluation Of Work Zone Speed Reduction Measures
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Author : T. H. Maze
language : en
Publisher:
Release Date : 2000
Evaluation Of Work Zone Speed Reduction Measures written by T. H. Maze and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Roads categories.
The Iowa Department of Transportation (DOT) has made improving work zone (WZ) safety a high priority. Managing vehicle speeds through work zones is perceived to be an important factor in achieving this goal. A number of speed reduction techniques are currently used by transportation agencies throughout the country to control speeds and reduce speed variation at work zones. The purpose of this project is to study these and other applicable work zone speed reduction strategies. Furthermore, this research explores transportation agencies' policies regarding managing speeds in long-term, short-term, and moving work zones. This report consists of three chapters. The first chapter, a literature review, examines the current speed reduction practices at work zones and provides a review of the relevant literature. The speed control strategies reviewed in this chapter range from posting regulatory and advisory speed limit signs to using the latest radar technologies to reduce speeds at work zones. The second chapter includes a short write-up for each identified speed control technique. The write-up includes a description, the results of any field tests, the benefits and the costs of the technology or technique. To learn more about other state policies regarding work zone speed reduction and management, the Center for Transportation Research and Education conducted a survey. The survey consists of six multipart questions. The third chapter provides summaries of the response to each question.
Work Zone Speed Management
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Author : John W. Shaw
language : en
Publisher:
Release Date : 2015
Work Zone Speed Management written by John W. Shaw and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Road work zones categories.
This synthesis documents information regarding the current state of practice for work zone speed management. The report compiles data, procedures, techniques, and technical issues related to observing and comparing work zone speeds. The speed management measures have been organized into four categories: engineering, operational, enforcement, and public education and outreach. Information included in this study was acquired through a review of the literature, two surveys of state department of transportation representatives in all states, a compilation of state agency public information campaigns, and follow-up interviews with select survey respondents from several U.S. states and one Canadian province.
Effectiveness Of Double Fines As A Speed Control Measure In Safety Corridors
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Author : Barnie Jones
language : en
Publisher:
Release Date : 2002
Effectiveness Of Double Fines As A Speed Control Measure In Safety Corridors written by Barnie Jones and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Automobile drivers categories.