Semi-trucks belong to a class of vehicles known as “articulated vehicles,” which are vehicles that are made up of various segments linked by movable joints. This construction allows these vehicles to be more maneuverable than they would be if they were made up of a single unit, but also makes them vulnerable to certain types of accidents to which non-articulated vehicles are not. Jackknife accidents are one of these types of accident that are unique to articulated vehicles and occur when the trailer of a truck swings out from behind the vehicle, resembling the action of a pocket knife.