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:
Work 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…MoreAddressing Work Zone Speed and Safety Webinar (Training)
This 90-minute workshop will discuss the effectiveness of various work zone countermeasures used to reduce speeds and address crashes in work zones. General countermeasures, such as dynamic speed fe… More
A 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…MoreDriver Feedback on Monetary Penalty and Its Impact on Work Zone Speed (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Across the nation, one work zone fatality occurs every 10 h (about 2.3 per day) and one injury, every 13 min (110 per day). Speed limit compliance in and around work zones concerns transportation agen…MoreSmart Speed Warnings Alert Drivers Nearing Freeway Work Zones (Publication)
Resource Type: News and Other Non-research Articles
Speeding in highway work zones has caused unexpected congestion and crashes. To combat this problem, the Minnesota Department of Transportation developed a Smart Work Zone Speed Notification (SWZSN) s…MoreFault-Tolerant Variable Speed Limit Control for Freeway Work Zone (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Freeway work zone can easily lead to traffic congestion which has detrimental effects on travel time and safety. By using the detected traffic states near work zone area, variable speed limit (VSL) co…MoreEvaluation of the Smart Work Zone Speed Notification System (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
The Smart Work Zone Speed Notification (SWZSN) system aims to alleviate congestion, queuing, and rear end crashes in work zones by informing drivers of the speed of the downstream segment using a type…MoreInfluence of Work Zone Signage on Driver Speeding Behavior (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 d…MoreVariable Speed Limit for Freeway Work Zone with Capacity Drop Using Discrete-Time Sliding Mode Control (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Freeway work zone with lane closure has a direct negative impact on travel time, safety, and environmental sustainability. The capacity drop at the onset of the congestion can also further reduce the …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…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…MorePredicting Traffic Dynamics with Driver Response Model for Proactive Variable Speed Limit Control Algorithm (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Variable Speed Limit (VSL) control contributes to potential crash risk reduction by suggesting a suitable dynamic speed limit to achieve more stable and uniform traffic flow. In recent studies, resear…MoreUse of Portable and Dynamic Variable Speed Limits in Construction Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Utah Department of Transportation (UDOT) implemented dynamic management of portable variable speed limit (PVSL) technology to reduce regulatory speed limits through an active work space (AWS), and UDO…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…MoreOptimal Variable Speed Limit Control System for Freeway Work Zone Operations (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Improving operational safety and efficiency of variable speed limit (VSL) systems are the two core control objectives at work zone areas. In response to such need, this study presents a proactive …MoreFlagger Operations: Investigating Their Effectiveness in Capturing Driver Attention (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
This two-pronged (driving simulation and field study) investigation of driver behavior in work zones contributes basic and applied knowledge to our understanding of work zone safety. In the driving si…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…MoreInvestigation of Effectiveness of Radar Speed Signs and Additional Lighting for Speed Control in Highway Construction and Maintenance Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Safely controlling and reducing vehicle speeds through work zones decreases the safety risk associated with highway construction and maintenance work. Work zone speed control has been the subject of…MoreOptimal Variable Speed Limit Control under Connected Work Zone and Connected Vehicle Environment (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Despite the long-term benefits gained through road maintenance projects, the work zone involved can cause serious traffic congestion and greatly increase traffic delay. Variable speed limit (VSL) enfo…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…MoreEvaluation of Variable Advisory Speed Limits in Congested Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
The effectiveness of variable “advisory” speed limit (VASL) systems in congested urban work zones was investigated. Except for one publication, all previous studies focused on regulatory speed lim…MoreInfluence of Truck-Mounted Radar Speed Signs in Controlling Vehicle Speed for Mobile Maintenance Operations: Oregon Case Study (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Radar speed signs (RSSs) are a measure for reducing traffic flow speeds through work zones. The influence of truck-mounted RSSs on vehicle speed was evaluated for mobile maintenance operations in two …MoreSpeed Signage Goes Electric in Two Area Work Zones (Publication)
Resource Type: Articles, 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.MoreHighway Construction Work-Zone Safety: Effectiveness of Traffic-Control Devices (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Pavement preservation is a proactive approach to maintaining existing highways. Freeway-preservation projects typically require construction workers to conduct their work in close proximity to ongoing…MoreSynthesis of Variable Speed Limit Signs (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
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 shou…MoreVariable Speed Limit Signs: Control and Setting Locations in Freeway Work Zones (Publication)
Resource Type: Books, Reports, Papers, and Research Articles
Variable Speed Limit Sign (VSLS) Systems enable speed limits to be changed dynamically in response to traffic conditions so that
traffic incidents can be reduced significantly on freeway work zones. …More