Samenvatting
Truck traffic accounts for a substantial fraction of the traffic stream in many regions and is often the source of localized traffic congestion. This paper presents the analysis and findings that recommend updated volume-delay relationships for transportation planning models that account for total volume, roadway capacity, and the mix of heavy truck traffic. The traditional Bureau of Public Roads function representing the speed-flow relationships for roadway facilities is modified to include the impact of truck traffic specifically. Several new speed-flow functions based on microsimulation results for freeways and urban arterials have been developed.