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Criteria for urban traffic infrastructure analyses – case study of implementation of Croatian Guidelines for Rounabouts on State Roads

Implementation and reconstruction of urban traffic infrastructure has proved to be very complex task because of different reasons. Among the most important are those connected with negative influence of motorized traffic on urban environment (congestions, safety, environmental problems) and those connected with urban surrounding (lack of free space, ambientality). During last decades there was great increase of reconstruction of standard intersections into roundabouts all over the middle Europe (Slovenija, Croatia, Italy ect.). Because of that the need to have objective and comprehensive estimation of the implementation of roundabout at the place of standard three or four leg intersection was established. In different countries were set, we can conclude based on different national regulation, similar criteria. Croatian Guidelines for Roundabouts at State Roads were adopted by authorities for state roads Hrvatske ceste in 2014. They prescribe estimation and comparison of solutions in the case of new or reconstruction of existing intersection into roundabout. The goal of this paper is to discuss proposed criteria by comparing it with widely used criteria for traffic infrastructure planning and design commonly used for urban traffic infrastructure. The suitability and universality of proposed criteria will be tested on two case studies where guidelines were implemented: four leg signalised intersection and three leg non signalized intersection situated on state roads in different urban context.

urban infrastructure; criteria; roundabout

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