GRADE LEVEL PLAN OF ROUNDABOUTS AS CONTENT OF PUBLIC ROAD PROJECTS

This paper provides an analysis and comparison of vertical alignment of classical intersections at one level and roundabouts and detects the problem of non-compliance with regulations that prescribes the required project content related to intersections. There are also some examples of roundabout drawings given as part of the content of public road projects. Until recently in Croatia, as a solution for a place of the intersection of traffic flows, classical intersections were dominantly applied at one level, and in that way the participants in the construction process had some requirements that are not applicable to roundabouts, both in the assignment of project tasks and for making technical drawings in order to process the altitude of roundabouts. Roundabouts have different geometry and, therefore, different inputs that are required for computer programs for road design than those for classical intersection design at a single level. The purpose of this article is to point out current issues and problems in roundabout design, while the aim of the paper is to recommend the content that the public road project must have in case of roundabout design.