What the study found
The study found that the relationship between intersection angle and crash risk is not the same as in previous studies. The authors report that agencies should consider modifying the minimum critical angle used in roadway design policies.
Why the authors say this matters
The authors say the findings matter because skewed intersections, where roads meet at less than 90 degrees, may create safety and operational problems. The study suggests that current geometric design policies and practices may need revision to reflect the results.
What the researchers tested
The researchers examined minor road stop-controlled intersections in Minnesota and Ohio. They used data-mining and regression techniques to identify important predictor variables, then estimated negative binomial regression models to derive crash modification functions for rural and urban three- and four-leg intersections.
What worked and what didn't
The models were used to estimate crash modification functions based on intersection angle. The resulting relationship between the crash modification factor and intersection angle differed from previous studies. The abstract does not report specific performance measures for individual model fits.
What to keep in mind
The abstract describes the analysis as focused on minor road stop-controlled intersections in Minnesota and Ohio, so the results are limited to that scope. It also notes that research on skewed intersections has been limited, and the abstract does not describe other limitations in detail.
Key points
- The study found a different relationship between intersection angle and crash risk than previous studies reported.
- The authors suggest roadway design policies should reconsider the minimum critical angle for intersections.
- The analysis used minor road stop-controlled intersections in Minnesota and Ohio.
- Data-mining and negative binomial regression were used to derive crash modification functions.
- The abstract does not provide detailed limitations or model performance measures.
Disclosure
- Research title:
- Skewed intersection angle is linked to different crash-risk patterns
- Authors:
- D L Harkey, Bo Lan, Raghavan Srinivasan, Wesley Kumfer, Daniel Carter, Anusha Patel Nujjetty
- Institutions:
- University of North Carolina at Chapel Hill
- Publication date:
- 2026-04-24
- OpenAlex record:
- View
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