Webinar Series

Applying Human Factors Principles to Rural Intersection Safety

June 15, 2020   |   Categories: Webinar Series

Last Updated on July 20, 2020


Raheem Dilgir is a Level 2 Road Safety Professional, with 25 years of experience in Canada and abroad. Raheem owns an operates TranSafe Consulting Ltd., assisting road agencies across Canada in the development, delivery and evaluation of road safety programs and projects. Raheem has developed road safety engineering guidance for the Transportation Association of Canada, Alberta Transportation, and other agencies. Altogether, he has led over 300 road safety audits and in-service reviews. Raheem is the founding co-Chair of the TAC Vision Zero and Safe Systems Subcommittee, and is a second-term Director of the Canadian Association of Road Safety Professionals. Raheem regularly offers workshops on road safety, presents to municipal councils and international conferences, and is called upon as an expert witness.Dr.

Title of Abstract

Applying Human Factors Principles to Rural Intersection Safety


The problem was the persistence in crashes and injuries in spite of numerous changes that were made at a rural intersection. Previous reviews were conducted with the traditional scope; therefore the Saskatchewan Ministry of Highways and Infrastructure commissioned a Human Factors Review to explore other perspectives and possible solutions to the problem.


The objective of the review was to explicitly consider the interaction between human behaviours/ capabilities, the infrastructure, and safety performance in determining the underlying causes of crashes at a rural intersection location. With this understanding, the second objective was to understand the human factors implications of various changes to the intersection design and traffic control.

Target Group

The review was carried out for the Ministry of Highways and Infrastructure staff, but the findings were of interest to higher levels of management due to the public safety impact. With the Humboldt tragedy of 2018, there has been an elevated awareness of the human factors in rural intersection safety design, and how they could play a role in crashes.


The Human Factors Review consisted of the elements of a traditional In-Service Road Safety Review (e.g. traffic volumes, collision data, geometry), but a with separate, focused effort on describing the human factors. This included an explicit analysis of the role of the surrounding environment on the driving task, in terms of expectancy, attentiveness, distraction, positive guidance, physical and cognitive demands, and visual field considerations.


The outputs that came from the review were:
-a more in-depth understanding of the users of the intersection (including age, vehicle type and residence)
-an understanding of the underlying causes of crashes at the location
-an evaluation of potential interventions from a human factors, and a ranking by potential effectiveness
-a quantification of the benefits and limitations of infrastructure changes to accommodate human factors