Expressway collisions tend to be more serious than those on other types of roads because:

Collisions on expressways tend to be more serious primarily because the average speed of vehicles on these roads is higher. When vehicles are traveling at greater speeds, the force of impact during a collision increases significantly. This higher kinetic energy contributes to more severe injuries and damage. The combination of high speeds and the potential for multiple vehicles traveling closely together can lead to catastrophic accidents when collisions occur.

Additionally, expressways are designed for faster travel, and drivers may not be as prepared for the potential for sudden stops or emergencies, compounding the risk of serious outcomes during accidents. In contrast, lower-speed situations found on other types of roads typically result in less severe crashes as the impact forces involved are lower.