| Collision Characteristic | Predictors | Odds ratio | 95% CL |
|---|---|---|---|
| Driver Characteristics | Gender: Male truck driver (0 if true; 1 otherwise) | 2.61* | 1.54-4.44 |
| Age group1: Younger driver: age <45 years (1 if true; 0 otherwise) | |||
| Violation record: Traffic record of one ticket or less (0 if true; 1 otherwise) | 1.48* | 1.10-1.99 | |
| Residency: State of Wyoming (0 if true; 1 otherwise) | - | - | |
| Environmental Characteristic | Weather condition1: Clear (0 if true; 1 otherwise) | - | - |
| Road condition1: Dry (0 if true; 1 otherwise) | - | - | |
| Vehicle characteristic | CMW weight: Truck greater than 26000 pounds (1 if true; 0 otherwise) | - | - |
| Temporal characteristic | Day of week1: Weekends (1 if true; 0 otherwise) | ||
| Time1: Peak hours 6< <22: (0 if true; 1otherwise) | - | - | |
| Roadway characteristic | Delta1 | - | - |
| Radios1 | - | - | |
| Horizontal Length1 | - | - | |
| Sag A1: Less than 2.0 (0 if true; 1 otherwise) | - | - | |
| Crest A1: Greater than -2 (0 if true; 1 otherwise) | - | - | |
| Posted speed limit: Speed limit less than 65 (0 if true; 1 otherwise) | 1.48* | 1.07-2.03 | |
| Crash characteristic | No of vehicle: 1 (0 if true; 1 otherwise) | 3.15* | 2.37-4.18 |
| Pre-collision vehicle actions1: Straight-ahead (0 if true; 1 otherwise) | - | - | |
| Manner of collision | |||
| Rear-end1 (1 if true; 0 otherwise) | - | - | |
| Sidewipe1 (1 if true; 0 otherwise) | - | - | |
| Others1 | - | - | |
| Head-on (1 if true; 0 otherwise) | 1.83* | 1.35-2.46 | |
| Rollover (1 if true; 0 otherwise) | 4.35* | 3.08-6.13 | |
| Occupant ejection: Driver is partially or totally ejected (1 if true; 0 otherwise) | 4.55* | 1.62-12.83 | |
| Driver behavior | Driver distraction: No distraction in truck (0 if true; 1 otherwise) | 2.57* | 1.76-3.75 |
| DUI suspicion: Driver was suspected of driving under the influence condition (1 if true; 0 otherwise) | - | - | |
| Sign of fatigue: Driver was fatigued (1 if true; 0 otherwise) | 3.69* | 2.281-5.990 | |
| CMV driver safety technology in use: Safety equipment was used (1 if true; 0 otherwise) | 9.64* | 3.03-30.65 | |
| Severity (response): no injury=0, injury or fatality=1 *indicates p<0.05 1 indicates insignificant variable included in the initial model |
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