Basic Intersection Crash Performance

Input Analysis Period (in years)
Input # of Fatal Crashes at Intersection (Not # of Persons Killed)
Input # of 'A' Severity Crashes at Intersection
Input # of 'B' Severity Crashes at Intersection
Input # of 'C' Severity Crashes at Intersection
Input # of Property Damage Crashes at Intersection
Input Average # of Vehicles Entering Intersection Daily*

*Average number of vehicles entering intersection can be calculated by adding ADTs for all of the intersection legs, and then dividing that by 2. This assumes that directional split of the roadway for the average day is 50/50.



Intersection Crash Rate = per million entering vehicles
Intersection Severity Rate =
Intersection Crash Density = crashes per year

Basic Segment Crash Performance

Input Analysis Period (in years)
Input # of Fatal Crashes on Segment (Not # of Persons Killed)
Input # of 'A' Severity Crashes on Segment
Input # of 'B' Severity Crashes on Segment
Input # of 'C' Severity Crashes on Segment
Input # of Property Damage Crashes on Segment
Input Segment Length (in miles)
Input Average Daily Traffic for Segment


Segment Crash Rate = per million vehicle-miles
Segment Severity Rate =
Segment Crash Density = crashes per mile per year