Effective management of urban congestion derives directly from accurate data collection and analysis at intersections. This study reports the outcome of a comparative investigation of the cost and efficiency of electronic and manual methods of collection of traffic delays for an urban rotary with the purpose of selection of the most preferred strategy for measurement at junction delays. The operation of traffic at peak period at Tanke roundabout Ilorin, Nigeria was evaluated with observatory

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... nual) and video-graphic for the data capture and analysis. A Sony video-graphic digital camcorder, type GIF, and full size image (460×329) was used to collect data on the flow rate and pattern operation at typical morning and evening peak periods, the data were analysed with corresponding cost, accuracy, easiness and convenience. Three improvement options; geometry modification to 2-lane on all the legs, 2-4 phase traffic signalization alone and geometry modification plus 2-phase signalization, were evaluated for a probable level of serviceability for the junction. The roundabout presently operating at LOS F respectively improved to LOS C for the geometry modification, the 2-4 phase fixed traffic signalization; but LOS A for the combined geometry/2-phase signalization strategy. The cost of data capture was ₦8,700 for the time lapse videography and ₦11,000 formanual method which implies that the video-time lapse data capture and analysis was 26% cheaper than the manual observatory counting method, and thus recommended as preference for an urban rotary delay management.