When you see images of the worst, most catastrophic collisions between commercial trucks and passenger vehicles, you may see vehicles damaged in an underride collision. These crashes occur when a smaller vehicle ends up underneath the larger commercial truck. The passenger vehicle often ends up crushed or may even have the top sheared off. The potential injuries to the occupants often prove fatal in these crashes.
An Interstate is never a safe place for pedestrians, but there are times when people do need to get out of their vehicles. Police and first responders, for example, get out of their vehicles in order to write tickets or help after crashes. When those officials do so, however, they take steps to ensure other motorists are aware. They can block lanes or even close roads, if necessary to protect themselves and the driver they're assisting.