Works on Horizontal Alignment of a Rural Road to Increase Sight Distances. A Case Study: The S.S.n°292

The functionality of a two-lane rural road depends on the possibility for faster vehicles to overtake slower vehicles. When overtaking is not possible, platoons arise and the level of service of the road decays.Assuring the passing sight distance along the alignment allows to road users to overtake in security.This paper presents a case study: the S.S. n°292, a two-lane rural road located in Sardinia, Italy, which has great problems on visibility. So different works on its horizontal alignment are proposed and their effects on sight distances have been analysed.