Abstract
The context in which this study is conducted is represented by the need to improve road safety at T-intersections, which can be visibility-critical locations and of the risk of accidents. Therefore, this study is important to identify and solve potential problems related to sight distance in road intersections. Case studies on sight distance in intersections are an effective way to assess the impact of the factors that influence it on road safety. Currently, the three-dimensional study allows us to analyze the visibility in detail according to the standards and obtain the sight distance both in tabular format and the graphic representation of the sight distance. The visibility triangle is defined as the spatial region formed by the path of the vehicle traveling along the main road and the vehicle traveling along the side road intersecting leading to the conflict point. The area of the visibility triangle depends on the prescribed sight distances, which must be observed based on the travel speeds of the conflicting paths. In this three-dimensional analysis, the sight distance at the intersection between a national road and an access road to a quarry, in the “T” variant, was studied. In this study, the sight distance checks were made in the “T” shaped intersection according to AND 600, with the help of the 3D model and the Civil Site Design software. Also, the influence of the angle cut slope on the sight distance from the intersections was studied considering 2 slope inclinations namely 1:2 and 1:4.