Highway Engineering Research Group (HERG), Universitat Politècnica de València, Camino de Vera, S/N, Valencia, Spain.
Accid Anal Prev. 2013 Dec;61:33-42. doi: 10.1016/j.aap.2012.10.001. Epub 2012 Nov 22.
To assist in the on-going effort to reduce road fatalities as much as possible, this paper presents a new methodology to evaluate road safety in both the design and redesign stages of two-lane rural highways. This methodology is based on the analysis of road geometric design consistency, a value which will be a surrogate measure of the safety level of the two-lane rural road segment. The consistency model presented in this paper is based on the consideration of continuous operating speed profiles. The models used for their construction were obtained by using an innovative GPS-data collection method that is based on continuous operating speed profiles recorded from individual drivers. This new methodology allowed the researchers to observe the actual behavior of drivers and to develop more accurate operating speed models than was previously possible with spot-speed data collection, thereby enabling a more accurate approximation to the real phenomenon and thus a better consistency measurement. Operating speed profiles were built for 33 Spanish two-lane rural road segments, and several consistency measurements based on the global and local operating speed were checked. The final consistency model takes into account not only the global dispersion of the operating speed, but also some indexes that consider both local speed decelerations and speeds over posted speeds as well. For the development of the consistency model, the crash frequency for each study site was considered, which allowed estimating the number of crashes on a road segment by means of the calculation of its geometric design consistency. Consequently, the presented consistency evaluation method is a promising innovative tool that can be used as a surrogate measure to estimate the safety of a road segment.
为了协助尽最大可能减少道路死亡人数，本文提出了一种新的方法，以评估双车道农村公路的设计和重新设计阶段的道路安全。该方法基于道路几何设计一致性分析，这是一个替代安全水平的度量标准。本文提出的一致性模型基于连续运行速度剖面的考虑。用于构建这些模型的模型是通过使用一种创新的 GPS 数据采集方法获得的，该方法基于从各个驾驶员记录的连续运行速度剖面。这种新方法使研究人员能够观察驾驶员的实际行为，并开发比以前使用点速数据采集更准确的运行速度模型，从而更准确地近似真实现象，从而实现更好的一致性测量。为 33 个西班牙双车道农村公路段建立了运行速度剖面，并检查了基于全局和局部运行速度的几个一致性测量值。最终的一致性模型不仅考虑了运行速度的全局离散度，还考虑了一些考虑局部速度减速和超过规定速度的速度的索引。为了开发一致性模型，考虑了每个研究地点的碰撞频率，这允许通过计算其几何设计一致性来估算道路段的碰撞数量。因此，所提出的一致性评估方法是一种很有前途的创新工具，可以作为替代指标来估计道路段的安全性。
