The Interactive Highway Safety Design Model (IHSDM) is a collection of assessment tools for assessing the safety conditions in transportation facilities, this paper aims to fill the gap in using the predicted approach to evaluate roadway safety performance in Iraq by applying the modern analytical methods in IHSDM software for the safety assessment. IHSDM was applied to three distinct sites of four-leg signalized urban intersections. The necessary data for IHSDM included geometric design data, traffic control data, and traffic volume data. Using Google Earth and AutoCAD Civil 3D-2021, the geometric design (including profile elevation, horizontal alignment, and cross-section) was recreated. These essential data were then imported into IHSDM as a Land XML file. The output consisted of a Crash Prediction Evaluation report, which included predicted crash frequencies, crash rates, percentages of predicted crashes, crash type distribution at intersections, predicted travel crash rates, and a summary of predicted intersection crash rates and frequencies by year. The results revealed that the percentage of predicted crashes changed over time: FI% decreased while PDO% increased at the same site. Rear-end collisions were the most common type of predicted crashes for all sites. Site (1) was classified as a more hazardous intersection, with predicted crash frequencies of 4.87 crashes per year. In contrast, Site (3) was considered a less dangerous intersection, with predicted crash frequencies of 4.11 crashes per year. Although the proposed safety evaluation process can be extended, this paper specifically focuses on the safety performance of urban signalized intersections, serving as a valuable reference for road safety research.

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Using Interactive Highway Safety Design Model (IHSDM) to Evaluate the Safety of Signalized Intersections at Kerbala City

  • Mustafa Mohammad Redha Mohammed Saed,
  • Hussein Ali Ewadh

摘要

The Interactive Highway Safety Design Model (IHSDM) is a collection of assessment tools for assessing the safety conditions in transportation facilities, this paper aims to fill the gap in using the predicted approach to evaluate roadway safety performance in Iraq by applying the modern analytical methods in IHSDM software for the safety assessment. IHSDM was applied to three distinct sites of four-leg signalized urban intersections. The necessary data for IHSDM included geometric design data, traffic control data, and traffic volume data. Using Google Earth and AutoCAD Civil 3D-2021, the geometric design (including profile elevation, horizontal alignment, and cross-section) was recreated. These essential data were then imported into IHSDM as a Land XML file. The output consisted of a Crash Prediction Evaluation report, which included predicted crash frequencies, crash rates, percentages of predicted crashes, crash type distribution at intersections, predicted travel crash rates, and a summary of predicted intersection crash rates and frequencies by year. The results revealed that the percentage of predicted crashes changed over time: FI% decreased while PDO% increased at the same site. Rear-end collisions were the most common type of predicted crashes for all sites. Site (1) was classified as a more hazardous intersection, with predicted crash frequencies of 4.87 crashes per year. In contrast, Site (3) was considered a less dangerous intersection, with predicted crash frequencies of 4.11 crashes per year. Although the proposed safety evaluation process can be extended, this paper specifically focuses on the safety performance of urban signalized intersections, serving as a valuable reference for road safety research.