مهندسی عمران-راه و ترابری
Hadi Shahsavari; Reza Amin; Ali Khodaii
Abstract
Providing road safety is an important social need. Ensuring road safety is one of the most rooted foundations in traffic engineering and transportation planning. Safety guards are one of the most common safety systems on the road. One of the most common road safety methods is using guardrails in the ...
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Providing road safety is an important social need. Ensuring road safety is one of the most rooted foundations in traffic engineering and transportation planning. Safety guards are one of the most common safety systems on the road. One of the most common road safety methods is using guardrails in the middle of intercity routes. In recent years, intermediate concrete separators (New Jerseys) gradually replaced guardrails. In recent years, intermediate concrete separators (New Jerseys) gradually replaced guardrails. This research aims to investigate the safety performance of two types of guards (Dividers) guardrail and New Jersey on the freeway of Qazvin-Zanjan. The replacement of guardrails with concrete barriers (New Jersey) in the toll section of Tehran Qazvin to Ziaabad range has been ongoing for a length of 68 km since the end of 2018 and the end of 2020. The study found that New Jersey's installation reduced head-on crashes by more than 96 percent. It has also had a significant impact on reducing the number of accidents. However, the study of accident statistics will accurately explain the effectiveness of New Jersey in reducing accidents. However, the decrease in the frequency of accidents in axles with concrete protection may be due to the sense of security that drivers experience while driving on axles equipped with New Jersey. This issue was raised in several previous studies
seyed reza shafaii amlashi; Reza Amin; Ali Khodaii
Abstract
Accidents in Iran pose a significant public health burden, requiring effective prevention and management strategies. Latent variable modelling provides a promising approach to understanding the complex factors that contribute to accidents in Iran. This paper reviews the current state of knowledge of ...
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Accidents in Iran pose a significant public health burden, requiring effective prevention and management strategies. Latent variable modelling provides a promising approach to understanding the complex factors that contribute to accidents in Iran. This paper reviews the current state of knowledge of latent variable modelling in Iran's accidents. The paper provides a synthesis of the literature on the measurement and modelling of latent variables in accidents, including human factors, environmental factors, and organizational factors, and also reviews the common statistical techniques used in the analysis of latent variables, such as structural equation modelling, latent class analysis, and factor analysis. The strengths and limitations of these approaches are discussed. The review shows that although some studies have applied latent variable modelling to accidents in Iran, the use of these techniques is still relatively limited in comparison to other countries. Overall, It has been argued that latent variable modelling can offer valuable insights into the underlying mechanisms of accidents in Iran and guide more effective strategies for prevention and management. This study used data from accidents resulting in the death or injury of passengers gathered on Iranian roadways in 2015, and the latent class model was fitted to this data using the NLOGIT6 software. And the findings have been reported in this article. The findings suggest that elements such as the season and day of the accident, as well as weather conditions, have an impact on the severity of accidents.
