Mapping it out
Dr. Sun and her team used Google Maps to verify the locations and construction years of each countermeasure. The crash analysis was done by crash severity, manner of collision, user type, time of the day, alcohol involvement, and distracted driver condition. Dr. Sun explained, “To capture all intersection-related crashes, the research team investigated all crashes within at least a 150-ft. radius of intersection. For few intersections with high AADT, crashes that occurred a half mile away from the intersections were also investigated considering potential traffic queues at the intersections.” The team also used original crash reports to further validate and verify crash characteristics in lane conversions.