Manual on Classification of Motor Vehicle Traffic Accidents ANSI D16.1-2007 3.5.2.1

GRADE SEVERITY COEFFICIENT CATEGORY
1 Minor 1% TO 20% Functional
2 Moderate 20% TO 40% Functional
3 Medium 40% TO 60% Functional
4 Major 60% TO 80% Disabling
5 Severe 80% TO 100% Disabling