Systemic Safety Project Selection Tool

Crash Tree for All Public Roads

This crash tree breaks down the type and location of crashes in a five-year period. The total number of crashes in the designated five-year period is 382,830, of which 8,311 are severe. The total number of crashes branches into four categories representing the jurisdictions that own the roadway systems: State System (41% of total crashes, 36% of severe crashes), County System (28% of total crashes, 41% of severe crashes), City/Township/Other (30% of total crashes, 23% of severe crashes), and Unmappable (<1% of total crashes, <1% of severe crashes). The remainder of the crash tree breaks down only the County System, as it represents the jurisdiction with the highest amount of severe crashes.

The next level splits Urban (46% of severe crashes in the County System) and Rural (54% of severe crashes in the County System), under which the latter splits into Animal (4% of Rural crashes) and Not Animal (96% of Rural Crashes). Both subsequent levels include Intersection-Related, Non Intersection-Related, and Other/Unknown. Under Non-Intersection Related, Urban includes Run off Road, Head On, Read End, and Other crash types, while Rural Includes Head On and Run Off Road, both of which split into whether the crash occurred On Curve.

Intersection-Related splits into Signalized, All-Way Stop, Thru-Stop, and Other/Unknown for both Urban and Rural. Under Urban Signalized, types of crashes include Right Angle, Rear End, Left Turn, and Head On. The majority of urban signalized intersection crashes are right angle, with 47% of these severe crashes. Under Urban Thru-Stop, types of crashes include Right Angle, Other, Left Turn, and Head On. The majority of urban thru-stop crashes are right angle, with 63% of these severe crashes.

Under Rural Other/Unknown, types of crashes include Run Off Road, Other, Head On, and Right Angle. The majority of Rural Other/Unknown intersection crashes are Run off Road, with 46% of these severe crashes. Under Rural Thru-Stop, types of crashes include Right Angle, Other, Run Off Road, and Head On. The majority of Rural Thru-Stop intersection crashes are right angle, with 54% of these severe crashes.