Approach for defining the limit value of the stopping sight distance on the roads in the Republic of North Macedonia

The most of the existing road network in the Republic of North Macedonia consists of sections that in the past were designed to provide the most durable and permanent engineering solutions of the carriageway, with minimal commitment to the road geometry. The visibility on the road is a key condition that would significantly contribute to better driving dynamics as well as to road safety. An analysis of Stopping Sight Distance (SSD) on all main roads was conducted within the paper. The visibility is checked simultaneously, through video recordings and CAD drawings, and is recorded tabularly by sections. In the analysis, checks are treated in two projections with additional subtypes: Horizontal solution (open route and intersections) and vertical solution (for convex and concave curves). The obtained values are quantified according to the length of each section, thus determining the individual sizes for each type. According to the resulting diagram of all the sections and the range from minimum to maximum, an economically acceptable visibility limit is defined through which all existing and future roads are weighted and it is defined whether they have a satisfactory visibility or not.