Traffic Safety Evaluation of Reduced Conflict Intersections in Minnesota

Status:  Complete
Report Date:  08/27/2021

Summary:

Between 2010 and 2020, 49 Reduced Conflict Intersections (RCIs) were installed on Minnesota Department of Transportation (MnDOT) roadways. The RCI is an alternative intersection layout that is intended to provide safety benefits by limiting the number of points within an intersection that two or more vehicle paths might intersect. Both a before-after analysis at RCIs as well as a cross-sectional analysis comparing RCIs to untreated intersections were conducted. With the installation of an RCI, both analyses yielded statistically significant decreases in fatal and serious injury crashes, angle crashes, and fatal and serious injury angle crashes. Statistically significant increases in rear end crashes were found. Both analyses showed no significant changes to sideswipe crashes or total crashes. Based on these results, severity shift in crashes is being seen at the RCIs in Minnesota. The overall number of crashes are not changing, but the high severity crashes are being reduced while property damage crashes are increasing. The large decreases in severe crashes at RCI locations indicate the RCI can be an effective safety treatment.

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