Guideline for Roundabout Circulatory Width Based on Vehicle Dynamics

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Current guidelines for roundabout circulatory roadway width are based on a static method that does not consider circulatory speed. This paper presents a method for determining the circulatory and entry widths based on a two-dimensional vehicle dynamics model that involves a system of differential equations of curvilinear motion. The method considers the interactions between a vehicle and road geometric elements, including tire sideslip, vehicle weight, vehicle speed, and vehicle stability. Three design vehicles are considered: intermediate semitrailer (WB-12), interstate semitrailer (WB-20), and city transit bus (CITY-BUS). Design guidelines for the required circulatory width are established for different circulatory speeds (0-60 km/h) and different inscribed circle diameters (30-80 m). To simplify the guidelines, for each design vehicle and for each inscribed circle diameter (ICD) the regression model of circulatory roadway width as a power function of circulatory speed was fitted. The results show the efficiency of the proposed method which provides smaller values of circulatory roadway widths than those of current methods.


Maksym Diachuk


Dr. Maksym Diachuk, a postdoctoral fellow, Ryerson University, Toronto, Canada (2016-2019). Associate professor, Mechanical Faculty, Prydniprovs’ka State Academy of Civil Engineering and Architecture, Ukraine (1998-2016). PhD in motor car and tractors, Kharkiv National Automobile and Highway University, Ukraine (2006). Vehicle dynamics and control.


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LAP LAMBERT Academic Publishing


Roundabout, Circulatory roadway width, Articulated Vehicle dynamics

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TECHNOLOGY / Engineering / General