From the point of view of highway design and traffic safety, curved roadway sections, including transition sections, represent one of the most important target areas for reducing accident frequency and severity. Statistical evaluations of accidents in Lebanon have revealed that the majority of traffic accidents occur close to or on curved sections of two-lane rural roads, primarily in the sense of exceeding the design speed for a curve and thereby losing control. Achieving consistency in horizontal alignment, thereby a consistent operating speed, is, therefore, an important issue to be considered in the design and redesign of two-lane rural roads to avoid possibly critical driving manoeuvers, which may driving manoeuvers, which may in turn lead to unfavourable accident risks. A method for identifying horizontal alignments that create speed transition problems for the motorist and recommendations for correcting them, for example, for new designs and redesigns in the case of resurfacing, restoration, and rehabilitation (RRR) projects, may be valuable in possibly reducing the accident risk on this important portion of the road network. This need has led to the present investigation. (A).
Samenvatting