| Variables or Risk Factor | Rd_char | Rdsurf | AADT | Weather | Light | Drv_age | Drv_sex | Vehtype |
| Rd_char | 1.000 | 0.716 | 0.856 | 0.639 | 0.778 | 0.097 | 0.069 | 0.055 |
| Rdsurf | 0.716 | 1.000 | 0.792 | 0.611 | 0.039 | 0.073 | 0.081 | 0.063 |
| AADT | 0.856 | 0.792 | 1.000 | 0.843 | 0.092 | 0.163 | 0.033 | 0.067 |
| Weather | 0.639 | 0.611 | 0.843 | 1.000 | 0.767 | 0.013 | 0.045 | 0.138 |
| Light | 0.778 | 0.039 | 0.092 | 0.767 | 1.000 | 0.082 | 0.119 | 0.038 |
| Drv_age | 0.097 | 0.073 | 0.163 | 0.013 | 0.082 | 1.000 | 0.043 | 0.016 |
| Drv_sex | 0.069 | 0.081 | 0.033 | 0.045 | 0.119 | 0.043 | 1.000 | 0.029 |
| Vehtype | 0.055 | 0.063 | 0.067 | 0.138 | 0.038 | 0.016 | 0.029 | 1.000 |