Conventional modern roundabouts have a circular geometry both for the inscribed circle and the central island, therefore the circulating roadway has a constant width. UNCONVENTIONAL GEOMETRY Today, it is known worldwide that modern roundabouts can greatly enhance traffic safety and operations. Future research is suggested for both data observation and capacity model calibration. Strategies including paved areas behind curbs, enlarging truck aprons, use of minimum slopes and mountable curbs are presented. Roundabouts with unconventional geometries are also investigated for better accommodating oversize/overweight large trucks (OSOW) on routes necessary to key industry and the economy. The same geometric combination is useful for enlarging the carriageway width corresponding to lower radii of curvature where high-occupancy vehicles require additional turning space. The combination of inner circular and outer oval shapes allow a reduction in carriageway width on the longer section and enhancement of path deflection. " Two-geometry roundabouts have a circular central island surrounded by an oval circulatory roadway. The paper presents an unconventional solution we call " two-geometry. This paper investigates roundabouts with unconventional geometry (non-circular) that have been proposed during the last decade to address special constraints of space and traffic conditions.
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