The objective of the proposed research is to study the traffic operational characteristics at four-way-stop-controlled (FWSC) intersections with single -lane approaches. Observational data were collected at six FWSC intersections in Lawrence, Kansas. Then, the necessary traffic data were extracted from the videotapes using data processing programs. With the collected data, a driver behavior based simulation approach was presented to estimate the 95th percentile queue length, control delay and service time. After calibration and validation, the simulation model was used to study characteristics of the queue length, control delay, and service time at FWSC intersections. Finally, intersection capacities were estimated under different traffic conditions.
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