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Abstract. Traffi c circles have been used in many countries all over the world. Traffi c circles can be defi ned as intersections where traffi c circulates around a center island where priority is given to the vehicles entering from branches and are designed considering weaving movements as the basic goal. Th ere are two most common capacity analysis methods for traffi c circles: the method of critical gap acceptance and the method of regression analysis. Th is study explains the methods of gap acceptance and regression analysis. Ashworth and Field method is investigated and the applicability of these capacity models in Turkey is discussed. Th e obtained results have shown that both methodologies give satisfactory results; however, the existing methods should be improved (modifi ed) considering conditions.

This paper proposes a multicriteria model for assessing public bus operation systems based on the ELECTRE method in the city of Eskisehir, Turkey. In this specific problem, public and expert opinions towards the privatization of urban bus lines were collected through a comprehensive survey to determine the best operation system; either by the local authority or private operators. The data collected include the opinions of four different groups of people namely: system users, transportation administrators, civil organizations and experts in the transportation field. The ELECTRE model yielded that the privatization of the bus system is preferred (by 37 to 14 points) over its operation by the public entity (local municipality).