TY - JOUR A2 - Szeto, W. Y. AU - Qu, Zhaowei AU - Duan, Yuzhou AU - Hu, Hongyu AU - Song, Xianmin PY - 2014 DA - 2014/04/10 TI - Capacity and Delay Estimation for Roundabouts Using Conflict Theory SP - 710938 VL - 2014 AB - To estimate the capacity of roundabouts more accurately, the priority rank of each stream is determined through the classification technique given in the Highway Capacity Manual 2010 (HCM2010), which is based on macroscopical analysis of the relationship between entry flow and circulating flow. Then a conflict matrix is established using the additive conflict flow method and by considering the impacts of traffic characteristics and limited priority with high volume. Correspondingly, the conflict relationships of streams are built using probability theory. Furthermore, the entry capacity model of roundabouts is built, and sensitivity analysis is conducted on the model parameters. Finally, the entrance delay model is derived using queuing theory, and the proposed capacity model is compared with the model proposed by Wu and that in the HCM2010. The results show that the capacity calculated by the proposed model is lower than the others for an A-type roundabout, while it is basically consistent with the estimated values from HCM2010 for a B-type roundabout. SN - 2356-6140 UR - https://doi.org/10.1155/2014/710938 DO - 10.1155/2014/710938 JF - The Scientific World Journal PB - Hindawi Publishing Corporation KW - ER -