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Performance of an urban corridor comprising of urban streets, signalized and unsignalized intersections gets highly influenced by the level of traffic operations at the unsignalized intersections. Unsignalized intersections under mixed traffic behave in uncontrolled manner due to lack of stop or yield signage. This study aims at assessing performance of urban uncontrolled intersections. Number of conflicting vehicles and their flow rates were used to develop mathematical models for service delay. Field service delays from 13 selected intersections form India were estimated and validated using PARAMICS after calibration using real time video data. Mean service delay for turning movements are analysed based on microscopic field investigation of driver travel time under different driver behavior. Two different traffic operational scenarios considering four-wheeler SUV stream at three-legged and four-legged intersections are compared. A thorough statistical investigation indicated that the conflict technique can predict 52% of field estimated service delays with a sensitivity of as low as 3 s/vehicle/lane for various traffic streams. The service delay, driver turning time and queue length models suggested can be utilized by practicing engineers to estimate intersection capacity and level of service of turning movements for better traffic operational management.