Download or read book Synthesis of Variable Speed Limit Signs written by U.s. Department of Transportation and published by Createspace Independent Publishing Platform. This book was released on 2018-07-23 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: Synthesis of variable speed limit signs /
Download or read book Synthesis of Variable Speed Limit Signs written by Bryan Katz and published by . This book was released on 2017 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: Variable speed limit (VSL) systems utilize information on traffic speed, occupancy, and volume detection, weather, and road surface conditions to determine the appropriate speeds at which drivers should be traveling, given current roadway and traffic conditions. The use of VSL during less than ideal conditions, such as heavy traffic and adverse weather, can improve safety by decreasing the risks associated with traveling at speeds that are higher than appropriate for the conditions and by reducing speed variance in traffic. In addition, VSL can be used to dynamically manage speeds during planned (rush hour congestion) and unplanned (incidents) events. Used in conjunction with managed lanes and other active traffic management strategies, VSL can respond to downstream congestion to eliminate or delay bottlenecks and mitigate the possibility of crashes. Based on a comprehensive literature review along with agency interviews to gather information on existing, deactivated and planned VSL systems, this synthesis provides a comprehensive review of current practices on VSL operations, particularly experiences from deployments in the United States, and to identify successful and best practices from the following perspectives: planning and policy, design, deployment, and standards, operations and maintenance, and outcomes.
Download or read book Variable Speed Limit Signs Effects on Speed and Speed Variation in Work Zones written by Matt Riffkin and published by . This book was released on 2008 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: Technological advances allow speed limits to be changed in real time based on actual roadway conditions. There may be potential advantages to using variable speed limits in Utah, such as for traffic control during construction where the speed limit may be lowered adjacent to actual construction activities versus at other times or locations within an established work zone. This research will test the compliance and derive potential advantages from the use of variable speed limit equipment.
Download or read book Evaluation of Variable Speed Limits in Work Zones written by Disapat Lavansiri and published by . This book was released on 2003 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Speed Reduction Techniques for Rural High to low Speed Transitions written by Gerry John Forbes and published by Transportation Research Board. This book was released on 2011 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: TRB's National Cooperative Highway Research Program (NCHRP) Synthesis 412: Speed Reduction Techniques for Rural High-to-Low Speed Transitions explores techniques for lowering traffic speeds in rural transition zones. Transition zones are those portions of high-speed roads that have lower posted speed limits as the roadway approaches a settlement.
Download or read book Collocation of Gantry mounted Variable Speed Limit Signs with Static and Monochrome Variable Message Signs written by and published by . This book was released on 2021 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guideline provides guidance when collocating static and dynamic signs on the same supporting gantry as variable speed limit (VSL) signs.
Download or read book Work Zone Variable Speed Limit Systems written by Nicholas J. Fudala and published by . This book was released on 2010 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: Variable speed limit (VSL) systems have been used in a number of countries, particularly in Europe, as a method to improve flow and increase safety. VSLs use detectors to collect data on current traffic and/or weather conditions. Posted speed limits are then dynamically updated to reflect the conditions that motorists are actually experiencing. Presenting drivers with speed limits that are appropriate for current conditions may reduce speed variance, a concept sometimes called speed harmonization. If properly designed, VSL systems have been shown to reduce crash occurrence and can also reduce system travel time through increased uniformity in traffic speeds. High-volume urban work zones tend to be prone to congestion and safety problems, and VSLs may be one way to ameliorate these issues. VSLs were recently installed at a high-volume, congested urban work zone located on I-495 (the Capital Beltway, hereinafter the Beltway) between the Springfield Interchange in Springfield, Virginia, and the Virginia-Maryland state line on the Woodrow Wilson Memorial Bridge. VSL signs were activated in late July 2008, but initial evaluations of the system showed inconclusive effects. Changing site conditions made a direct before-and-after evaluation of the system deployed in the field problematic, and some problems with the control algorithm were also noted. Given the difficulties in evaluating the system deployed in the field, a calibrated simulation of the site was constructed to assess the effects of the VSL system on traffic operations and safety surrogate measures. The simulation platform also provided an opportunity to examine a number of system configurations to assess how changes in system design and driver behavior might affect a variety of measures. The results indicated that the VSL could create substantial improvements in traffic operations provided the demand did not exceed capacity by too large a margin. The location of the VSL signs played an important role in operational performance. The study recommends that the Virginia Department of Transportation continue to pursue this technology but carefully scrutinize algorithm design and VSL sign placement. Further, a cost/benefit analysis indicated that VSLs may be most appropriate for long-term applications.
Download or read book Development and Testing of Variable Speed Limit Control Logics for Work Zones Using Simulation written by Byungkyu Park and published by . This book was released on 2003 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been a considerable increase in the amount of construction work on the U.S. national highways in recent years. This is a direct result of the current transportation policies emphasis on the maintenance of existing facilities rather than on building new ones. But with the increase in the amount of traffic on the interstates, the safety at the construction sites is getting worsened. Variable speed limit (VSL) systems are a kind of intelligent transportation systems (ITS) technology and they try to increase safety by posting the maximum or minimum speed limits. The speeds to be posted on the VSL signs are calculated manually or with the help of algorithms. This study is an attempt to evaluate the performance of various speeds at work zones and to develop VSL control logics that would calculate suitable speeds for different traffic conditions. The research is conducted by simulating a postulated test-bed network and then validating the results by simulating a real world work zone site. The study uses a microscopic simulation model - VISSIM. The study developed a safety surrogate measure, minimum safety distance equation (MSDE), to quantify safety. Travel times have primarily been used to quantify mobility. Since most of the existing VSL control logics consider only the traffic advisory speed or average traffic speed, an attempt was made to develop a logic that would consider both safety and mobility in calculating speeds. The results of simulating the postulated network indicated that the performance of speeds varied with traffic demand volumes and compliance rate conditions. In general an increase in speed decreased safety, but improved travel time. Surprisingly at low volume and low compliance conditions an increase in speed also improved safety. In order to find the speeds that provide optimal measures of safety and mobility a normalization procedure that combines travel time and safety measures is used. The performance of the logics is mixed. In general logic 3 (that considers both safety and mobility measures to calculate VSL speed) performed better than logics 1 and 2 (that use average traffic speed). However logics 1 and 2 performed better than Logic 3 for oversaturated conditions and for low volume and low compliance conditions. Statistical analysis was performed to substantiate the results of the base cases and the logics. The performance of the VSL system was also evaluated by simulating a real world work zone site at Covington, Virginia. The results were found to be consistent with those of the postulated network.
Download or read book Permanent Placement of Variable Speed Limit and Lane Control Signs for Motorways Long Bridges and Tunnels written by and published by . This book was released on 2021 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guideline defines the placement and mounting requirements for variable speed limit signs (VSLS) and variable speed limit and lane control signs (VSL / LCS) on motorways, long bridges and in tunnels. Please check provided website / URL for currency.
Download or read book Transport and Main Roads Specifications written by and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Technical Specification defines the design, supply, installation, testing and commissioning, performance, documentation, training, maintenance, and handover requirements for Temporary Variable Speed Limit (TVSL) signs.
Download or read book Synthesis of Practices for Work Zone Speed Management written by M. D. Harmelink and published by TAC = ATC. This book was released on 2005-01-01 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: Speeding in work zones is one of the most common traffic violations observed by road builders and road maintenance crews. It creates an unsafe environment for road workers and all types of road users. This synthesis is intended to help address this situation by reviewing work zone speed management efforts in Canada and the United States. The report provides an overview of technologies and methods for managing speed in work zones, with topics ranging from posted speed limit reductions and narrowing lanes to portable variable message signs and enforcement. In addition, the report discusses other methods for speed management, including merge control, driver and worker education, and real-time traffic information systems. The report also provides a number of conclusions and recommendations based on the synthesis, which identify some of the key problems and solutions.
Download or read book Model Predictive Control for Integrating Traffic Control Measures written by András Hegyi and published by . This book was released on 2003 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Methods and Practices for Setting Speed Limits written by Gerry John Forbes and published by . This book was released on 2012-09-01 with total page 107 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This informational report describes four primary practices and methodologies (engineering approach, expert systems, optimization, and injury minimization) that are used in establishing speed limits. It also reviews the basic legalities of speed limits and presents several case studies for setting speed limits on a variety of roads"--Provided by publisher.
Download or read book Synthesis of Highway Practice written by National Cooperative Highway Research Program and published by . This book was released on 2000 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Literature Review on Vehicle Travel Speeds and Pedestrian Injuries written by W. A. Leaf and published by . This book was released on 1999 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book GB 5768 5 2017 Translated English of Chinese Standard GB5768 5 2017 written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2018-12-08 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This part of GB 5768 specifies the general requirements and use of speed limit for road traffic signs and markings. This part applies to the setting of the speed limit signs and markings on all kinds of roads including highway, urban roads, places which is under the jurisdiction of the unit but allows social vehicles to pass, squares, public parking lots, other places which are used for public access. The speed limit signs and markings which are set in other places where motor vehicles pass, parking lots, etc. can make reference to this standard.
Download or read book NCHRP 3 59 written by Alexander Weiss and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
