Resource Type: Manuals, Policies, Guidelines, and Handbooks, etc.
The IWZ Toolbox has been prepared as a guideline for selecting an appropriate Intelligent Work Zone (IWZ) System for existing work zone traffic issues and to mitigate anticipated issues on scheduled p…MoreVariable Speed Limit Systems
Featured Items:
Speedcheck Radar Speed Signs Increase Work Zone Safety for Medford’s Department of Public Works: Speed Displays Prove Highly Effective at Slowing Traffic During Road Projects that Put Workers and Drivers at Risk (Publication)
Resource Type: News and Other Non-research Articles
After a successful experiment with a speedcheck radar speed sign on a street repair project to slow down drivers and increase worker safety, the city of Medford, Oregon, now regularly uses speedcheck …MoreA Managed Work Zone on Colorado’s I-25 Exemplifies Technology’s Life-Saving Value to Workers and Travelers Alike (Publication)
Resource Type: News and Other Non-research Articles
In September 2018, the Colorado DOT began construction on the I-25 South Gap project. Teaming up with Street Smart, which manages the Smart Work Zone equipment and integration, various Smart Work Zone…MoreSmart Work Zone Deployment Initiative Wisconsin Evaluations Summer 2001: Mobile/Stationary Speed Boards (You/Me Boards) (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
The present report is an evaluation of the Mobile/Stationary Speed Boards (You/Me Boards), a portable system measuring the speed of the maintenance vehicle on which the device is mounted and the speed…MoreEvaluating Effectiveness of Dynamic Speed Display Signs in Transition Zones of Two-Lane Rural Highways in Pennsylvania (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Although law enforcement is an effective method to manage speeds, it requires significant resources to ensure adequate spatial and temporal compliance. In some cases, alternative speed management meth…MoreEffectiveness of VSL Signs in Reducing Crash Rates on Roadway Construction Work Zones in Alaska (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
As a driver's speed increases, so do the probability of an incident and likelihood of injury. The presence of equipment, personnel, and a changing landscape in construction zones create greater potent…MoreDevelopment and Testing of Variable Speed Limit Control Logics for Work Zones Using Simulation (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
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 resear…MoreImpact of Work Zone Signage on Driver Speeding Behavior: A Driving Simulator Study (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Speeding in a work zone needs to be tackled effectively to enhance work zone safety. This study evaluates the influence of three different work zone signs – speed photo enforced signs, dynamic speed…MoreImproving Compliance with Work Zone Speed Limits: Effectiveness of Selected Devices (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Thousands of crashes occurring in work zones each year lead to numerous fatalities and injuries. The sizeable portion of these crashes attributed to excessive speed emphasizes the need to motivate dri…MoreInnovative Traffic Control Devices for Improving Safety at Rural Short-Term Maintenance Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
The Texas Department of Transportation (TxDOT) and the Federal Highway Administration (FHWA) sponsored a Texas Transportation Institute (TTI) research project to determine if innovative traffic contro…MoreEvaluation of Speed Monitoring Displays for Work Zones in Las Vegas, Nevada (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Speed monitoring displays (i.e., speed trailers) have been evaluated in many states for reducing vehicular speeds in work zones. This study evaluated the enhancements to speed trailers regarding messa…MoreInteraction Between System Design and Operations of Variable Speed Limit Systems in Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Variable speed limits (VSLs) have been shown to improve safety and operations on European freeways, but work zone applications of VSLs have been limited. In July 2008, a VSL system was installed on a …MoreStudies to Improve the Management of Regulatory Speed Limits in Texas Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
This report describes the methodology and results of analyses performed to (1) improve existing procedures on establishing and managing work zone speed limits, and (2) evaluate new technologies and st…MoreSimulation and Evaluation of Speed and Lane-Changing Advisory of CAVS at Work Zones in Heterogeneous Traffic Flow (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Emerging connected autonomous vehicle (CAV) technologies provide an opportunity to the vehicle motion control to improve the traffic performance. This study simulated and evaluated the CAV-based speed…MoreVariable Speed Limits Signs: Effects on Speed and Speed Variation in Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Variable Speed Limit (VSL) signs are used across the country in conjunction with Intelligent Transportation Systems to lower posted speed limits in areas affected by conditions such as congestion, con…MoreVariable Speed Limit Sign: Effects on Speed and Speed Variation in Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
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 c…MoreITS Safety and Mobility Solutions: Improving Travel Through America’s Work Zones (Publication)
Resource Type: Brochures and Fact Sheets
This brochure provides an overview of the commonly used ITS applications that are easily implemented into any work zone, their potential benefits, considerations for use, and system layouts. It is in…MoreEvaluation of the Effectiveness of a Variable Advisory Speed System on Queue Mitigation in Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Variable Advisory Speed Systems (VASS) provide drivers with advanced warning regarding traffic speeds downstream to help them make better decisions. Vehicle use on highways is increasing and the need …MoreMotorists’ Speed Response to Nonvariable and Variable Work Zone Speed Limits and Other Work Zone Conditions (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Transportation professionals view the setting of appropriate regulatory speed limits on public roads, including those under repair or reconstruction, as an important tool in promoting safe and efficie…MorePreliminary Evaluation of Dynamic Speed Displays with Conditional Messaging (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Changeable message signs (CMSs) and dynamic speed displays (DSDs) for speed management applications have been deployed to address multiple situations. These have often been reported to produce benefic…MoreWork Zone Crashes Climb During Pandemic, Even as Traffic Ebbs (Publication)
Resource Type: News and Other Non-research Articles
Work zone crashes and fatalities have increased in some states during the COVID-19 pandemic, despite the drop in traffic. Highway workers are at more risk than ever as distracted drivers speed through…MoreSpeed Signage Goes Electric in Two Area Work Zones (Publication)
Resource Type: News and Other Non-research Articles
Variable speeds have been used in other states, but the signs are new to Ohio. Two northwest Ohio work zones are the region's first to use electronic signs with changeable speed-limit numbers.MoreIdentification and Testing of Measures to Improve Work Zone Speed Limit Compliance (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Thousands of crashes occur in work zones each year, leading to numerous fatalities and injuries. A sizeable portion of these crashes can be attributed to excessive speed, which emphasizes the need to …MoreInventory of Best Practices to Prevent Incursions into Work Zones – Literature Review (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
The aim of this report was to review the literature to identify existing best practices used to prevent incursions into work zones and improve safety of road users and road workers. A systematic liter…MoreMinnesota IWZ Toolbox: Guideline for Intelligent Work Zone System Selection (Publication)
Resource Type: Manuals, Policies, Guidelines, and Handbooks, etc.
The IWZ Toolbox has been prepared as a guideline for selecting an appropriate Intelligent Work Zone (IWZ) System for existing work zone traffic issues and to mitigate anticipated issues on scheduled p…MoreVariable Speed Limit Control for Delay and Crash Reductions at Freeway Work Zone Area (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Improving operational efficiency and safety on freeway segments has long been recognized as a priority in traffic communities. This study presents a comprehensive variable speed limit (VSL) control mo…MoreVariable Speed Limits Ease Congestion, Reduce Crashes on Highways: Study (Publication)
Resource Type: News and Other Non-research Articles
In an effort to make traffic move more smoothly, researchers at the University of Missouri tested the effectiveness of Variable Advisory Speed Limit (VASL) systems, which provide drivers with a recomm…More