The purpose of this paper is to determine the quality of highway service at signalized roundabout. Consequence, delay studies were carried out at a signalized intersection with composite traffic control mechanism. Bearing in mind that composite traffic control mechanisms are two or more traffic control devices, data for single and composite signalized intersections were analysed and compared. Results show a slightly improved level of service with roundabout, more importantly significant reduction in conflicting movement and gridlock was achieved when the traffic signals were switched off. The study concluded that signalized roundabouts have significant influence on vehicular conflict, gridlock that may reduce red light running.
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