A Survey on the State of the Art on Rational Road Geometric Design and Traffic Operations in Overseas Countries

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As is often the case with some developed overseas countries, careful considerations should be given to details of road geometric design and traffic operations, in order to secure rational functions of road sections corresponding to their hierarchical categories. This study aims at collecting information and data regarding the issues mentioned above in some overseas countries, in order to investigate some improvements on road geometric design and traffic operation in Japan. By visiting universities and administration offices, interviews to several researchers and experts were performed, and related guidelines, manuals, research reports and practical project reports were obtained. Furthermore, traffic flow surveys through video recordings were conducted at four typical signalized intersections (3 in Germany and 1 in UK) and nine roundabouts (5 in Germany, 2 in US and 2 in Australia). These data were analyzed from a viewpoint of user behavior considering their geometric and operational features.