The objective of this research project was to identify and evaluate strategies to mitigate end-of-queue crashes at flagging stations on two-lane roads. The research team evaluated the following … [Read more...] about Evaluation of End-of-Queue Crash Mitigation Strategies at Flagging Stations on Two-Lane Roads
Traffic Queuing
Work Zone Intelligent Transportation Systems – Technology Supplement
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
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