| Collision Characteristic | Predictors | Odds Ratio | 95% CL |
|---|---|---|---|
| Driver characteristics | Gender: Male truck driver (1 if true; 0 otherwise) | 0.35* | 0.19-0.62 |
| Age group1:Younger driver: age <45 years (1 if true; 0 otherwise) | - | - | |
| violation record1 : Traffic record of one ticket or less (0 if true; 1 otherwise) | - | - | |
| Residency1: State of Wyoming (0 if true; 1 otherwise) | - | - | |
| Speed limit compliance1: Truck Driver followed Speed Limit(0 if rue, 1 otherwise) | - | - | |
| Environmental characteristics | Weather condition1: Clear (0 if true; 1 otherwise) | - | - |
| Roadway-surface condition: Dry (0 if true; 1 otherwise) | 0.19* | 0.14-0.27 | |
| Light condition1: daylight (0 if true; 1 otherwise) | - | - | |
| Vehicle characteristics | CMW weight1: Truck greater than 26000 pound (1 if true; 0 otherwise) | - | - |
| Temporal characteristics | Day of week1 : Weekends(1 if true; 0 otherwise) | - | - |
| Time1: Peak hours 6< <22: (0 if true; 1otherwise) | - | - | |
| Posted speed limit : Speed limit less than 65 mi/hr(0 if true; 1 otherwise) | 1.63* | 1.11-2.47 | |
| Roadway characteristics | Traffic1 | - | - |
| Crash characteristics | No of vehicle 1: 1(0 if true; 1 otherwise) | - | - |
| Pre-collision vehicle actions1: Straight-ahead(0 if true; 1 otherwise) | - | - | |
| Manner of collision1 | - | - | |
| Rollover/Jackknife(1 if true; 0 otherwise) | 3.62* | 2.38-5.52 | |
| Occupant ejection1: Driver is partially or totally ejected(1 if true; 0 otherwise) | - | - | |
| No improper driving1 (1 if true; 0 otherwise) | - | - | |
| Drove too fast for conditions1: (1 if true; 0 otherwise) | - | - | |
| Fail to keep proper lane1: (1 if true; 0 otherwise) | - | - | |
| Driver behaviors | Driver distraction: No distraction in truck(0 if true; 1 otherwise) | 1.72* | 1.16-2.60 |
| DUI suspicion1 : Driver was suspected of driving under the influence condition(1 if true; 0 otherwise) | - | - | |
| Sign of fatigue1: Driver was fatigued(1 if true; 0 otherwise) | - | - | |
| CMV driver safety technology in use1: Safety equipment was not used (1 if true; 0 otherwise) | - | - |