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
Traffic Queuing
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
Use of Smart Work Zone Technologies for Improving Work Zone Safety: A Synthesis of Highway Practice
To make work zones safer, state departments of transportation (DOTs) use smart technologies with specialized components, such as sensors, communications, software, and electronic equipment, to manage … [Read more...] about Use of Smart Work Zone Technologies for Improving Work Zone Safety: A Synthesis of Highway Practice
Characterizing Interstate Crash Rates Based on Traffic Congestion Using Probe Vehicle Data
Crash reduction factors are widely used by engineers for prioritizing safety investments. Work zones are routinely analyzed by the length and duration of queues. Queue detection warning technology has … [Read more...] about Characterizing Interstate Crash Rates Based on Traffic Congestion Using Probe Vehicle Data
Queue Analysis at Work Zones From Field-Collected Data
Estimation of the capacity of work zones is vital to manage the possibility of traffic flows exceeding capacity and resulting in unbearable queues during work zone lane closures. A plethora of … [Read more...] about Queue Analysis at Work Zones From Field-Collected Data