Segmentation Methodology Based on Road Attributes and Accidents for Rural Two-Lane Roadways

Traditional segmentation methodologies focus on the definition of homogeneous segments for identifying crash locations and perform safety analysis. Homogeneous segments are usually defined based on standard lengths or roadway attributes, including the number of lanes, shoulder or/and median presence, traffic volume, segments between intersections, operating speed and vertical grade. These segmentation approaches do not consider the drivers’ behavior and therefore, safety analysis is affected from the segmentation methodology which is based on the geometric and physical attributes of a roadway. The goal of this paper is to present a novel segmentation methodology which combines road attributes and accidents, which relate to drivers’ behavior, to estimate the segment length of rural two-lane roadways and to support transportation decision making. The proposed segmentation methodology uses the concept of road uniformity; a uniform road should have the same degree of accident risk in all of its segments. Data are used for a 5 year period for 26 rural two-lane two-way roadways for the southern part of Greece. First, the road uniformity factor is quantified and its relationship with traffic volume and road length is determined by using the ordinary least square and the robust multiple regression analysis. The final model for estimating segment length considers the traffic volume, the standard deviation and the mean number of accidents per road segment. Segmentation model results show that the estimated length of an independent – uniform segment of a rural two-lane roadway decreases as the traffic volume increases. The proposed methodology can be used to support decision making in transportation by identifying independent roadway segments for subcontracting, maintaining and application of safety measures.


  • English

Media Info

  • Media Type: Digital/other
  • Features: Figures; References; Tables;
  • Pagination: 13p
  • Monograph Title: Proceedings of the 25th World Road Congress - Seoul 2015: Roads and Mobility - Creating New Value from Transport

Subject/Index Terms

Filing Info

  • Accession Number: 01676908
  • Record Type: Publication
  • ISBN: 9782840604235
  • Report/Paper Numbers: 0306
  • Files: TRIS
  • Created Date: Jul 26 2018 1:11AM