The first modern roundabout in Kansas was constructed in Manhattan in 1997. The operation of this roundabout intersection was compared with two comparable 2-way STOP controlled intersections and with different traffic control scenarios. Traffic count data was collected with a 360 degree omnidirectional video camera. Traffic data was evaluated with computer program SIDRA (Signalized and Unsignalized Intersection Design and Research Aide). The analysis results were statistically tested to determine which intersection(s) operated statistically better. When compared to the two comparable 2-way STOP intersections, the roundabout performed worse of the same for three of the evaluate measures; average delay, 95 percentile queue and proportion stopped. The roundabout operated better with regard to maximum approach delay, maximum proportion stopped and degree of saturation. The roundabout intersection was also evaluated under three different traffic control scenarios: two-way STOP, four-way STOP and four-way STOP with separate left turn lanes. This evaluation found the roundabout to operate better than the other alternatives with respect to all measures. Prior to roundabout construction, the intersection experienced an average of 3 traffic crashes, with at least one injury per year. Since completion in November 1997, the roundabout has experienced no reported traffic crashes.
Modeling Traffic Flows and Conflicts at Roundabouts
2000
118 pages
Report
No indication
English
Transportation & Traffic Planning , Transportation , Road Transportation , Highway Engineering , Traffic models , Traffic flow , Signalized intersections , Traffic volume , Traffic control , Highway transportation , Traffic safety , Statistical analysis , Traffic accidents , Traffic delay , Traffic simulation , Traffic circles , United States , Roundabout , Stop-controlled intersections
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