Abstarct: The presence of roundabouts in the central business districts (CBD) of cities can reduce the travel speed of bus rapid transit (BRT) along the radial routes. A through-about is an unconventional and low-cost design, in which the central island is split to provide exclusive lanes for major traffic streams. Although the operation of through-about has been limitedly investigated for private transportation, it has been less considered by designers for public transportation and for increasing the speed of the BRT system. The current study aims to evaluate the effects of through-abouts on private and public transportation, traffic safety, and to compare the design with standard roundabouts and conventional intersections. The calibrated and validated results of the micro-simulation tool (AIMSUN) indicated that the through-about improved the travel time of both public and private transportation through better use of the space and kept the traffic flowing at all volume levels. The travel speed of the BRT in the through-about was remarkably stable in both signal-controlled and unsignalized intersections. The numbers of injury accidents and injured pedestrians in a 5-year period in the through-about were equal to 99 and 48, respectively, almost half of the corresponding numbers in a standard roundabout.