ISSN Print: 2984-8288, ISSN Online: 2984-8385 Vol. 2, No. 8, pp. 544-550, August 2024 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). Assessment of Road Safety Through Geometric Design Analysis: The Case of Sagonsongan Diversion Road in Marawi City Jalaloden M. Motalib*, Nassib U.H. Nasser, Jamshed D. Mangacop, Abdul Warith M. Mamaingco Department of Civil Engineering, Mindanao State University-Main Campus, Marawi City, Philippines *Corresponding Author Email: jalalmotalib04@gmail.com Date received: April 4, 2024 Originality: 98% Date revised: July 12, 2024 Grammarly Score: 99% Date accepted: July 18, 2024 Similarity: 2% Recommended citation: Motalib, J., Nasser, N., Mangacop, J., Mamaingco, A.W. (2024). Assessment of road safety through geometric design analysis: The case of Sagonsongan diversion road in Marawi City. Journal of Interdisciplinary Perspectives, 2(8), 544-550. https://doi.org/10.69569/jip.2024.0113 Abstract. This study critically assessed the impact of geometric design on road safety. This assessment was based on a detailed analysis of the case of Sagonsongan Diversion Road in Marawi City, the Philippines. Applying quantitative methods such as a survey using Real-Time Kinematics and software-based road designing using AutoCAD Civil 3D, the study thoroughly analyzed the geometric design elements of the road, such as horizontal alignment, vertical alignment, and superelevation. Thus, the study showed that all geometric features were highly inconsistent with the safety standards. In particular, the high curve radius and slope aspect ratio significantly increase the risk of traffic incidents. The evaluation of two key curve sections has demonstrated that the road's overall geometric design directly affects drivers' ability to keep their cars stable. To eliminate the risk of traffic wretchedness, this study has suggested several corrective measures, including redesigning the road to adjust the geometrical aspects to safe norms, setting accurately calculated speed limits, reinstalling road signs, and conducting continuous safety checks. These measures will help to bring the Sagonsongan Diversion Road’s design to the level of established safety standards and decrease possible incidents to the minimum. The study has provided important findings on the relevance of established road designing principles to road safety. This work can be useful for the existing discussion regarding engineering and policy measures that should be considered to enhance road safety, especially in countries with developing economies. This study has also illustrated the importance of continued geometric design assessment in ensuring road safety and adapting the safety requirements to the dynamic needs of road users. Keywords: Road safety; Geometric design; Curve radius; Slope grade; Marawi City. 1.0 Introduction Road safety is a vital concern worldwide, impacting policies influencing transportation, urban planning, and engineering practices. The geometric design of the road, including curvature, grade, and alignment, highly impacts vehicular movement and determines the safety and appropriateness of travel being facilitated. Road safety can be evaluated through the Sagonsongan Diversion Road located in Marawi City, Philippines, due to its unique characteristic of showcasing road geometric design and its factors that affect driving conditions. While the road is vital in connecting Marawi City to the respective neighboring municipalities, it has been in the years since its commission faced several traffic incidents, leading to a growing concern about the safety and appropriateness of vehicular motor facilitation. The curvature of the two curve portions on the Sagonsongan Diversion Road has caused concern amid the escalating traffic incidents and emerging transportation congestion. On August 2, 2022, a car crash incident occurred along Sagonsongan Diversion Road, as reported by the Marawi CDRRMO, where two passengers were injured though safely brought to the nearest hospital (One Bangsamoro News). One of the