Transportation Research Record Journal of the Transportation Research Board · 1978 · 14 citations · 0 references
EngineeringTransportation PlanningCapacity PlanningQueuing TheoryTransportationHighway Capacity AnalysisHighway Geometric DesignIntersection DesignTraffic EngineeringTraffic OperationsTraffic SafetyField StudiesLane CapacityRoad AdministrationSignal TimingSignal Timing AnalysisSignalized Intersection CapacityTraffic CapacityTraffic Signal Timing
Calculations of signal timing and capacity have been performed in Sweden by using methods based on the 1950 and 1965 Highway Capacity Manuals. These methods, however, give results that differ by as much as 50 percent from observed flows. A comprehensive development was therefore undertaken by the Swedish National Road Administration from 1971 to 1976. After extensive literature reviews, theoretical analyses, and field studies, a method was developed for calculating signal timing, capacity, queue length, proportion of stoped vehicles, and delay. The method is based on calculating saturation flows separately for each lane, which makes the method applicable to all geometric designs and phasing schemes. Adjustment factors for vehicle-acutuated control are also included. Study emphasis was on the relations among approach width, lane markings, and capacity; conflicts between left-turning and opposing flows; and conflicts between turning vehicles and pedestrians. The signal-timing method is based on the minimum average delay criterion proposed by Webster. /Author/