Download or read book Safe and Effective Speed Reductions for Freeway Work Zones Phase 2 written by John Anthony Gambatese and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Freeway preservation projects typically require construction workers to conduct their work in close proximity to ongoing traffic and often reduce traffic flow to a single lane while work is undertaken in an adjacent lane. Due to the short-term nature of these work zones, temporary traffic control measures typically consist of a line of cones, blocker vehicles, and impact attenuators. Work zones place both the workers and passing motorists at risk of injury. The Oregon Department of Transportation conducted a research study to investigate the impact of selected traffic control devices on vehicle speeds within highway paving project work zones. The research study, which follows a similar study conducted a year earlier, centered around two case studies on multi-lane paving projects in Oregon. On each case study, the researchers implemented combinations of multiple traffic control devices ("Speed 50" signs, PCMS signs, and radar speed displays) and evaluated their impact on vehicle speed. The research findings suggest using a combination of reduced speed limit signs, radar speed monitoring displays, and PCMS signs on either trailers or rollers. The results of the present study complement those of the prior study and, combined with the prior study, provide ODOT with guidance on the selection of traffic control measures for freeway preservation projects.
Download or read book Research Project Work Plan for Safe and Effective Speed Reductions for Freeway Work Zones Phase 2 written by John Anthony Gambatese and published by . This book was released on 2013 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Safe and Effective Speed Reductions for Freeway Work Zones Phase 3 written by John Anthony Gambatese and published by . This book was released on 2015 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Freeway pavement preservation projects typically require construction workers toconduct their work in close proximity to ongoing traffic and often reduce traffic flow to a single lane while work is undertaken in an adjacent lane. During the lane closures, the paving operations place workers on the roadway within a protected work zone. The Oregon Department of Transportation conducted a research study to investigate the impact of 35mph advisory signs, located periodically in the work zone, on vehicle speeds within highway paving project work zones. The research study, which follows two similar studies that addressed other traffic control devices (SPR-751 and SPR-769), centered around one case study on a multi-lane paving project in Oregon. On the case study, the researchers implemented the 35mph advisory signs along with other traffic control devices ("Speed 50" signs with radar speed display, and PCMS signs on rollers) and evaluated the impact of the 35mph signs on vehicle speed and speed variability. The research findings indicate that using the 35mph signs leads to lower vehicle speeds within the work zone. The reduction in speed is greater for passenger cars than for trucks. Use of 35mph advisory signs in future ODOT work zones is recommended to help reduce vehicle speeds through the work zones.
Download or read book Speed Management written by European Conference of Ministers of Transport and published by OECD Publishing. This book was released on 2006-10-13 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: Speeding is the number one road safety problem in a large number of OECD/ECMT countries. It is responsible for around one third of the current, unacceptably high levels of road fatalities. Speeding has an impact not only on accidents but also on the ...
Download or read book Safe and Effective Speed Reductions for Freeway Work Zones Phase 3 written by John Anthony Gambatese and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Freeway pavement preservation projects typically require construction workers toconduct their work in close proximity to ongoing traffic and often reduce traffic flow to a single lane while work is undertaken in an adjacent lane. During the lane closures, the paving operations place workers on the roadway within a protected work zone. The Oregon Department of Transportation conducted a research study to investigate the impact of 35mph advisory signs, located periodically in the work zone, on vehicle speeds within highway paving project work zones. The research study, which follows two similar studies that addressed other traffic control devices (SPR-751 and SPR-769), centered around one case study on a multi-lane paving project in Oregon. On the case study, the researchers implemented the 35mph advisory signs along with other traffic control devices ("Speed 50" signs with radar speed display, and PCMS signs on rollers) and evaluated the impact of the 35mph signs on vehicle speed and speed variability. The research findings indicate that using the 35mph signs leads to lower vehicle speeds within the work zone. The reduction in speed is greater for passenger cars than for trucks. Use of 35mph advisory signs in future ODOT work zones is recommended to help reduce vehicle speeds through the work zones.
Download or read book Work Zone Speed Management written by John W. Shaw and published by . This book was released on 2015 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Improving Work Zone Safety Through Speed Management written by Norman M. Sommers and published by . This book was released on 2013 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Safety hazards are increased in highway work zones as the dynamics of a work zone introduce a constantly changing environment with varying levels of risk. Excessive speeding through work and maintenance zones is a common occurrence which elevates the dangers to both drivers and motorists in the work zone. Although most work zones are controlled by reduced speed limits or state law enforcement, driver adherence to these regulations and laws in very minimal, especially in work zones. Several studies have shown a correlation between speeding in work zones and traffic crashes which lead most traffic safety professionals to conclude that excessive speeding and speed variance are the contributing factors in a large percentage of traffic crashes, injuries or fatalities. The most influential factor in achieving speed compliance in the work zone is the driver's perception of heightened risk. The main objective of this study was to determine the safest and most effective countermeasure for the reduction of vehicular speeds within construction and maintenance work zones. The purpose of the simulator experiment was to determine the effectiveness of 20 countermeasures on the reduction of speed through work zones in a controlled laboratory setting. The literature review identified several past research studies utilizing speed reduction countermeasures in work zones and under normal traffic conditions. From this review, 20 countermeasures were selected for evaluation based upon discussions with ODOT personnel.The post hoc tests indicated that the presence of construction workers, presence of construction vehicles, law enforcement, speed photo enforcement and shifting lanes were most effective at reducing speeds in work zones. The least effective speed reduction countermeasures included 3 sets of 3 rumble strips, concrete barriers, other channelizing devices and changeable message signs with speed reductions less than 10 mph.
Download or read book Strategies for Work Zone Transportation Management Plans written by Leverson Boodlal and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the ways a state department of transportation or other transportation agency can address work zone safety and other impacts is to develop and implement a Transportation Management Plan (TMP). The TRB National Cooperative Highway Research Program's NCHRP Research Report 945: Strategies for Work Zone Transportation Management Plans provides a practitioner-ready guidebook on how to select and implement strategies that improve safety and traffic operations in roadway construction work zones. Supplemental materials to the report include NCHRP Web-Only Document 276: Evaluating Strategies for Work ZoneTransportation Management Plans; fact sheets on ramp meter, reversible lane, and truck restrictions; and guidebook appendices.
Download or read book Evaluation and Summary of Studies in Speed Control Methods in Work Zones written by R. F. Benekohal and published by . This book was released on 1992 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report summarizes and evaluates the important findings from the literature review of the studies on work zone speed control techniques. The following treatments are included in this report: 1) flagging, 2) lane width reduction, 3) law enforcement, 4) changeable message signs (CMS), 5) rumble strips, and 6) flashing beacons. The effects of the speed control treatments on speed and traffic flow are evaluated based on: A) experiences with treatment, B) effects of treatment on speed, C) effectiveness of treatment, and D) comments about treatment. A brief description of the conditions under which the treatments were applied is provided, and the speed reduction effects of each technique are discussed. A reference matrix was prepared to identify publications related to each type of speed reduction treatment used in work zones.
Download or read book Controlling Speeds in Highway Work Zones written by Stephen H. Richards and published by . This book was released on 1984 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Traffic Law Enforcement in Work Zones written by and published by . This book was released on 2010 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt: NCHRP Project 3-80 was initiated to develop guidance on the effective use of traffic enforcement strategies in highway work zones. Traffic enforcement is viewed by many as one of the most effective means available for reducing speeding and other undesirable driving behaviors that compromise safety in a highway work zone. However, practices nationally vary widely on the enforcement strategies and philosophies used in work zones, the administrative mechanisms applied to establish and maintain a work zone enforcement program, payment methods for work zone enforcement efforts, techniques applied to supplement work zone enforcement, and public information dissemination practices employed to support work zone enforcement in a region. In this report, results are described of three research efforts performed to facilitate the development of guidance on this topic: 1) determination of whether driver opinions, perceptions, and behaviors related to the risk of violating traffic laws in work zones differ depending on whether work zone enforcement practices in a region are predominantly passive (positioned in the work zone with lights flashing to attract attention and reduce speeds) or active (pursuit of violators and issuance of citations); 2) determination of the effects of using an enforcement officer and vehicle in a traffic-calming (passive enforcement) mode upstream of work zones where traffic queues develop on the speed, deceleration, and erratic maneuvers of traffic approaching the traffic queue; and 3) a generalized economic analysis of the potential crash cost reductions associated with the provision of enforcement in work zones was undertaken to determine AADT thresholds at which the benefits of providing enforcement in work zones exceeds the costs of enforcement. With respect to the first point, these studies indicate that the use of passive enforcement does not significant degrade driver perceptions of enforcement or driver response to enforcement compared to active enforcement use. Next, studies of enforcement upstream of work zone traffic queues were somewhat inconclusive, and did not indicate a clear effect of having enforcement deployed in this manner. Finally, the analysis of work zone crash costs suggests that enforcement safety benefits outweigh the costs of deployment in daytime work zones on roadways exceeding 5000 to 20,000 vehicles per day (depending on hourly enforcement costs), and at nighttime work zones on roadways exceeding 20,000 to 65,000 vehicles per day.
Download or read book Report written by and published by . This book was released on 1964 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Speed Variation and Safety in Work Zones written by John Anthony Gambatese and published by . This book was released on 2021 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: In addition to lower speeds, the difference between vehicle speed and the average speed on the roadway has been identified as a factor in roadway crashes. For work zones, the potential for such speed variation from the average speed is magnified. The safety associated with speed variation in work zones affects both motorists driving through the work zone and the workers in the work zone. The overall goal of this research is to develop additional knowledge and practices that can be used to improve driver and worker safety in work zones and, as a result, mobility through work zones. The research focuses on high-speed roadways (e.g., highways and freeways) and typical mobile construction and maintenance operations that occur on such roadways (e.g., paving and re-striping). The research presented in this report involved a review of the archival literature germane to the topic of speed variation (with and without a work zone), the analysis results of speed variation and crash occurrence, and the impacts of selected traffic control interventions on speed variation in work zones in Oregon. The PCMS unit showing alternating messages "MAINTAIN CONSTANT SPEED" and "THRU WORK ZONE" in two phases and placed at the advance warning area was found to effectively reduce speed variation in the work zone. Based on the findings, the researchers recommend use of PCMS units that display custom messages to maintain constant speed for work zone operations on high-speed roadways.
Download or read book Effectiveness of Changeable Message Signs in Controlling Vehicle Speeds in Work Zones written by Nicholas J. Garber and published by . This book was released on 1998 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Evaluation of Work Zone Speed Reduction Measures written by T. H. Maze and published by . This book was released on 2000 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Speed Control Through Work Zones written by and published by . This book was released on 1987 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Roundabouts written by Lee August Rodegerdts and published by Transportation Research Board. This book was released on 2010 with total page 407 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Report 672: Roundabouts: An Informational Guide - Second Edition explores the planning, design, construction, maintenance, and operation of roundabouts. The report also addresses issues that may be useful in helping to explain the trade-offs associated with roundabouts. This report updates the U.S. Federal Highway Administration's Roundabouts: An Informational Guide, based on experience gained in the United States since that guide was published in 2000.
