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 |


