- Do severe crashes occur disproportionately in head-on collisions when driver impairment or poor lighting conditions are present?
- Head-on collisions have the highest severe crash percentage at 4.46%, which is substantially higher than other collision types such as motorbike (2.37%) and angle collisions (2.01%). The dashboard also shows that severe crash percentages are highest under low-light conditions (5.87%), suggesting that reduced visibility may increase the likelihood of severe outcomes in head-on crashes.
- When focusing specifically on driver substance involvement, the visualization shows that head-on collisions involving multiple substances (combination) have extremely high severe crash percentages, reaching around 30–33%, which is much higher than cases involving alcohol (about 4–5%), drugs (around 12%), or medication (around 9%) alone. This indicates that driver impairment, particularly when multiple substances are involved, may significantly increase the severity of head-on collisions.
- Do crashes disproportionately occur in bad weather and wet surfaces rather than nice conditions?