INFLUENCE OF SIGHT DISTANCE CHARACTERISTICS ON SAFETY OF INTERSECTIONS USING SURROGATE SAFETY MEASURES

IF 0.2 Q4 MULTIDISCIPLINARY SCIENCES Suranaree Journal of Science and Technology Pub Date : 2023-10-09 DOI:10.55766/sujst-2023-04-e01017
Ramireddy Sushmitha, Vattipally Bhanu Prakash Reddy, KVR Ravishankar
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Abstract

Recent road accident statistics indicate that more than 30% of accidents occur at intersections. Whereas, total percentage of intersections present in the entire road network is less than 2%. From design point of view, one way to ensure reduction of accidents at intersections is to provide sufficient sight distance and clear sight triangles. However, it was observed that even when minimum sight distance is provided, it does not ensure non-occurrence of accidents because available sight distance at intersection changes with time. Hence there is a need to understand the effect of sight distance characteristics on safety at uncontrolled intersections. From safety studies, it was observed that crash data is highly unreliable as it is generally underreported. Hence in the present study, surrogate safety measures were used instead of crash data. To accomplish the study objectives, six uncontrolled three-legged intersections were selected. Geometric data such as sight distance was measured as per IRC SP 41 (1994) guidelines. Traffic data collection at each intersection was carried out using videography method. From the recorded videos, volume data, speed data, and Post Encroachment Time (PET) data were extracted manually. The effect of various geometric and traffic factors on the critical conflict rate was studied using correlation and regression analysis. From the models developed, it is observed that for every 1 unit increase in logarithm of major and minor road sight distance, critical conflict rate decreased by 18.14% and 33.56%, respectively. Also, it was found that, the available sight distance is far shorter than the design/minimum sight distance specified by IRC SP 41 (1994).
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利用替代安全措施研究视距特征对交叉口安全的影响
最近的道路交通事故统计表明,30%以上的事故发生在十字路口。然而,整个道路网络中存在的十字路口的总百分比不到2%。从设计的角度来看,保证交叉口事故减少的一种方法是提供足够的视距和清晰的视三角形。然而,我们观察到,即使提供了最小视距,也不能保证不发生事故,因为交叉口的可用视距随时间而变化。因此,有必要了解视距特性对非受控交叉路口安全的影响。从安全研究中可以观察到,事故数据是非常不可靠的,因为它通常被低估了。因此,在本研究中,使用替代安全措施代替碰撞数据。为了实现研究目标,选择了6个不受控制的三足交叉口。根据IRC SP 41(1994)指南测量了视距等几何数据。采用摄像法采集各路口交通数据。从录制的视频中,人工提取体积数据、速度数据和后侵占时间(PET)数据。采用相关分析和回归分析的方法,研究了几何因素和交通因素对临界冲突率的影响。从所建立的模型可以看出,道路主次视距的对数每增加1个单位,临界冲突率分别降低18.14%和33.56%。此外,发现可用的瞄准距离远远小于IRC SP 41(1994)规定的设计/最小瞄准距离。
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来源期刊
Suranaree Journal of Science and Technology
Suranaree Journal of Science and Technology MULTIDISCIPLINARY SCIENCES-
CiteScore
0.30
自引率
50.00%
发文量
0
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