Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).

Akeem Amuda; Abubakar Makusidi Mohammed

doi:10.5455/NJEAS.184852

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NJEAS. 2025; 2(2):

doi: 10.5455/NJEAS.184852

Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).

Akeem Amuda, Abubakar Makusidi Mohammed.

Abstract
Abstract
This research evaluated the influence of road geometric attributes on crash frequency. Survey data of the route was collected and used to design the 15km road using AutoCAD civil 3D. This design is according to the judgment of the survey team in terms of alignment according to the route conditions; and serves as the control for the study. The geometry of the design was altered by increasing the curves' radii by 15 and 30m to yield alternative design options 2 and 3 respectively. AutoCAD resets other geometric elements such as superelevation and slopes that best fit the new radii. The three design versions are modeled in AIMSUN NEXT for microsimulation of their traffic dynamics. Trajectories of traffic for each designed road corridor were collected and analyzed in the Surrogate Safety Assessment Model (SSAM) crash assessment for each. Increasing the curve radius from 135m (specified by the software) to 150m and 165m for options 2 and 3 respectively. Increasing the radius by 15m on the average for curves has eliminated some of the curves by integrating some closely spaced ones into some single and much more decent curves. Cord lengths for the resulting new curves were also elongated by this action. There is a fall in total conflicts from 2,682 in design option 1 to 1,688 in option 2. An additional increase in average curve radii in option 2 from 150 to 165m to yield option 3 roadway geometry yielded a much greater decrease in conflicts from 1,688 to 34 in options 2 and 3 respectively. Microsimulation and Surrogate safety assessment demonstrated prospects for crash predictions and mitigation and are applicable for both the operation and planning of road transportation systems.

Keywords: roadway geometry, traffic conflicts, AutoCAD Civil 3D, AIMSUN NEXT, SSAM, Trajectories

Key words: Keywords: roadway geometry, traffic conflicts, AutoCAD Civil 3D, AIMSUN NEXT, SSAM, Trajectories

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Pubmed Style

Amuda A, Mohammed AM. Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).. NJEAS. 2025; 2(2): -. doi:10.5455/NJEAS.184852

Web Style

Amuda A, Mohammed AM. Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).. https://www.nilejeas.com/?mno=184852 [Access: March 05, 2025]. doi:10.5455/NJEAS.184852

AMA (American Medical Association) Style

Amuda A, Mohammed AM. Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).. NJEAS. 2025; 2(2): -. doi:10.5455/NJEAS.184852

Vancouver/ICMJE Style

Harvard Style

Amuda, A. & Mohammed, . A. M. (2025) Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).. NJEAS, 2 (2), -. doi:10.5455/NJEAS.184852

Turabian Style

Amuda, Akeem, and Abubakar Makusidi Mohammed. 2025. Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).. Nile Journal of Engineering and Applied Science, 2 (2), -. doi:10.5455/NJEAS.184852

Chicago Style

Amuda, Akeem, and Abubakar Makusidi Mohammed. "Evaluating the Effects of Changes in Roadway Geometric Elements in Crash Frequency in a New Rural Road Using AIMSUN Traffic Management Software and Surrogate Safety Assessment Model (SSAM).." Nile Journal of Engineering and Applied Science 2 (2025), -. doi:10.5455/NJEAS.184852

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APA (American Psychological Association) Style

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About Nile Journal of Engineering and Applied Science The Nile Journal of Engineering and Applied Sciences publishes original peer-reviewed articles on fundamental and applied research and reviews ... Read more. For best results, please use Internet Explorer or Google Chrome.	Contact Information 1. Prof. Abdulhameed Danjuma Mambo Editor-in-Chief abdulhameed.mambo@nileuniversity.edu.ng 2. Dr. Adekunle Adeleke Associate Editor-in-Chief adekunle.adeleke@nileuniversity.edu.ng 3. Dr. Ifeyinwa Obianyo Managing Editor ifeyinwa.obianyo@nileuniversity.edu.ng