In order to evaluate the service level of roundaboutsintuitively, a new delay model of signalized roundabouts isestablished. According to traffic flow characteristics in thesignalized roundabout, vehicle delays on roundabouts aredivided into two parts： entrance delay and circulating lanedelay. Entrance delay is calculated by the delay model inHCM2010. Circulating lane delay is studied by analyzingconflict behavior in signalized roundabouts, and the delaymodels of traffic flows turning in different directions areestablished based on the motorcade analysis method. Finally,the simulation software Vissim, calibrated with field data, isused to verify the model. The simulation results show that theaverage relative error of the model is 10. 1%, meeting theaccuracy requirements. Therefore, the delay model properlyreflects the operation efficiency of a roundabout, and can thusorovide a scientific basis for the design of control schemes.
Liu HuanfengSong XianminZhang LibinTao PengfeiYang Qiujie
