Montella A. ROUNDABOUT DESIGN CRITERIA: AN INTERNATIONAL OVERVIEWRoundabouts are hastily spreading around the world, mainly because of their good safety performance, and several countries have recently updated their standards and guidelines. However, inconsistencies in design standards and practices are observed. In this paper, a critical review of the Australasian, EU and US standards and guidelines is performed. As a result, key issues and best practices of the existing standards are identified. Based on this review, it is recommended to adopt the concepts of design flexibility and performance based design. Indeed, rigid standards, which do not really take into account safety and operational consequences of the design decisions and the need to balance opposing demands, might produce undesirable outcomes. Finally, research areas to fill the knowledge gaps are identified. Key words: roundabouts, geometric design, sight distance, speed control, radius of deflection, entry path radius, deviation angle, safety, standards, guidelines.
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Author: Montella A.
|Sergey Aleksandrovich |