This report represents a technology supplement to the 2014 Work Zone Intelligent Transportation Systems (WZITS) Implementation Guide (Report No. FHWA-HOP-14-008). The Guide forms the foundational … [Read more...] about Work Zone Intelligent Transportation Systems – Technology Supplement
Traffic Queuing
Intelligent Work Zone Using Automatic Queue Detection Systems
This report documents the the evaluation of the effectiveness of the Advanced Queue Detection (AQD) systems installed on Interstate work zones in Nebraska. Specifically, (1) the system performance was … [Read more...] about Intelligent Work Zone Using Automatic Queue Detection Systems
Verification and Efficacy of Automated Queue Detection Systems on Interstate Intelligent Work Zones
Intelligent work zones have been widely adopted in the United States because they have been proven to improve traffic safety and operations. One specific intelligent work zone system, known as … [Read more...] about Verification and Efficacy of Automated Queue Detection Systems on Interstate Intelligent Work Zones
Issues With Work Zone Free Flow Speed Computation in 6th Edition HCM and Proposed Improvements
Free flow speed (FFS) and capacity of work zones (WZ) directly affect queue length and delay in the WZ. The 6th Edition of Highway Capacity Manual introduced a new model to estimate WZ FFS and … [Read more...] about Issues With Work Zone Free Flow Speed Computation in 6th Edition HCM and Proposed Improvements
Calibration and Validation Methodology for Simulation Models of Intelligent Work Zones
Intelligent work zone (IWZ) systems use innovative technologies in real time to mitigate the negative impacts of work zones on the traveling public. The automatic queue detection (AQD) system is one … [Read more...] about Calibration and Validation Methodology for Simulation Models of Intelligent Work Zones
Ohio DOT Testing ‘Smart’ Work Zone Safety Systems
The Ohio Department of Transportation is in the process of testing several different technologies, such as queue detection systems and variable speed limit signs, designed to improve work zone safety … [Read more...] about Ohio DOT Testing ‘Smart’ Work Zone Safety Systems