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Autonomous vehicles (AVs) are about to be used in transportation systems inthe near future. To increase the level of safety and throughput of thesevehicles, dedicated lanes for AVs have been suggested in past studies asexclusive mobility infrastructure for these types of vehicles. Although theselanes can bring obvious advantages in a transportation network, overallperformance of these lanes, especially in urban areas and in micro level sight,is not clear. This study aims to examine the efficiency of dedicated lanes forAVs in roundabout with an unbalanced traffic flow pattern. Four factors oftravel time, delay time, speed of vehicles, and queue of vehicles have beenselected as variables of traffic performance at the roundabout. Two microscopictraffic simulation software, AIMSUN and SIDRA Intersection, were used toexamine the impact of the AV dedicated lanes at the roundabout. This studyshows that the effects of an imbalanced traffic pattern in a roundabout arehigher when the penetration rate of AVs is lower and also dedicated lanes inroundabout's leg may improve traffic performance indicators when thepenetration rate of AVs is higher, but this improvement is not significant.

Evaluation of Dedicated Lanes for Automated vehicles at Roundabouts with Various Flow Patterns