Assessment of delays at roundabout

Traffic delay is the additional travel time that experienced by a road user beyond what would reasonably be desired for a given trip. it is also a standard parameter that used to measure the performance of an intersection. this study concerns with the delay experienced by the drivers at a roundabout. the main objective is to evaluate the applicability of the existing theoretical delay models to estimate delays. data pertaining to the analysis of delay was collected at a conventional roundabout in a sub-urban area. the t-test were conducted. the result shows that the observed delay at a conventional roundabout can be estimated using akcelik & troutbecks theory as there is no significant different between both observed and theoretical delay at 95% confident level. whereas the observed delay has significant different if compared with theoretical delay estimated using kimber & hollis theory and cetur formula. on the other hand,all of the theoretical and observed delay at the roundabout falls in the los a. however,more data are required in order to validate the result of this study. © 2015 penerbit utm press. all rights reserved.