Author(s)

I. Legac, H. Pilko & D. Brčić

Abstract

The paper deals with the issues regarding the need for the reconstruction of a large three-lane roundabout with the reached AADT traffic of over 90,000 [veh./day] and intense tram traffic at the level below the road surface. Since the existing roundabout dates back to 1985, the design solution with tangential merging of three-lane approaches provides an additional cause and reason for reduced capacity and safety component of the entire intersection. In the new urban, and commercial and spatial surrounding, with the help of radical reconstruction it is necessary to achieve a modern design solution, for which purpose extensive interdisciplinary research was conducted. Common multidisciplinary methods and criteria are presented in six proposed design solutions, with particular focus on the capacitive-safety and design elements and their interrelations. Keywords: large three-lane roundabout, reconstruction, capacity-safety-design, multi-disciplinary analysis, investment decision. 1 Introduction The paper presents the reconstruction analysis of the Jadranska Avenue and Dubrovnik Avenue for the purpose of which three conceptual solutions have been used (N. Šubić, AKING/GF and M. Vukušić). The objective of the performed analyses is to find the optimal traffic, urban, and technical solution, using multi-criteria procedures and decision-making. The reasons for the design are presented as well as the current traffic condition on the location of this roundabout, and all the problems regarding the capacity and safety of traffic. The presented data and the description of the traffic and safety problems show the

Keywords

large three-lane roundabout, reconstruction, capacity-safety-design, multi-disciplinary analysis, investment decision.