Impact of lane closures on roadway capacity, phase 2 : [summary].

PDFTech ReportBDK77-977-18Two lane highwaysLane closureHighway capacityWork zonesTravel demandData collectionField studiesTraffic estimationTraffic diversionSimulationPerformance measurementFloridaFlorida. Dept. of TransportationWashburn, ScottUniversity of Florida. Dept. of Civil and Coastal EngineeringUS Transportation CollectionMaintenance or construction on two-lane roads often requires setting up a work zone which closes one lane and uses the other for both traffic directions. Workers posted at each end of the work zone allow traffic to flow alternately one way and then the other, often causing delays for drivers. There are no national standards for the design, operation, and impact of work zones, and the Florida Department of Transportation (FDOT) has commissioned studies to address this issue.In a previous project (BD545-61), University of Florida researchers developed a simulation program, FlagSim, based on major factors that influence work zone performance measures for lane closures on two-way, two-lane roads. They also developed methods to estimate traffic diversion from the work zone. In this project, the same team advanced their work by calibrating FlagSim with field data, also addressing the effect of grade on work zone performance and updating the estimation of traffic demand in work zones