Comparative analysis of methodologies for In-built Network-wide Road Safety Assessments

In-built Network-wide Road Safety Assessment (IRSA) procedures involve the visual inspection of road design characteristics, and assigning scores to sections of the road network based on the availability and condition of the road characteristics. The main objective of the study was to evaluate two IRSA methodologies developed for rural highways, that is the Simplified methodology, and the Networkwide Proactive methodology (NWA Proactive). Both methodologies are applied on a 10.41 km, two-lane undivided rural road section in Latina Province, Italy. The assessment focused on comparing the reliability and predictive performance of these methods. The results revealed that the level of agreement of the rankings from both methods is moderate, while, they both showed poor correlation with crash history. This indicates that there is a need for continuous testing and development of IRSA methodologies since existing ones have a great variation in terms of the choice of parameters such as; risk factors, segmentation approach, risk formulation, and ranking categories. The insights derived from this study are very relevant to road technicians and practitioners involved in road safety assessment procedures.

• Record URL:
  • https://doi.org/10.55329/ktxy3871
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/20043082
• Supplemental Notes:
  • Copyright (c) 2026 Elvis Chia Ngwah, Stephen Kome Fondzenyuya, Steffel Ludivin Feudjio Tezong, Brayan González-Hernández, Davide Shingo Usami, Luca Persia. This work is made available under the terms of the Creative Commons Attribution 4.0 International license, https://creativecommons.org/licenses/by/4.0/
• Authors:
  • Chia Ngwah, Elvis
  • 0009-0003-2257-227X
  • Fondzenyuya, Stephen Kome
  • Tezong, Steffel Ludivin Feudjio
  • 0000-0003-1435-075X
  • González-Hernández, Brayan
  • 0000-0003-0440-817X
  • Usami, Davide Shingo
  • Persia, Luca
• Publication Date: 2026-1-20

Language

• English

Media Info

• Media Type: Web
• Features: Figures; References; Tables;
• Pagination: 11p
• Serial:
  • Traffic Safety Research: An Interdisciplinary Journal
  • Volume: 10
  • Publisher: Lund University, Sweden
  • ISSN: 2004-3082
  • Serial URL: https://tsr.international/TSR/index

Subject/Index Terms

• TRT Terms: Evaluation; Highways; Methodology; Rural highways; Safety
• ITRD Terms: 9020: Evaluation (assessment); 2755: Highway; 9102: Method; 1672: Road safety audit; 2775: Rural road; 1665: Safety
• Subject Areas: I82: Accidents and Transport Infrastructure;

Filing Info

• Accession Number: 01978792
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Report/Paper Numbers: e000125
• Files: ITRD, VTI
• Created Date: Feb 5 2026 11:54AM