IPSI Work Zone Temporary Traffic Control (TTC) Technician Practice Test

The correct answer is that stationary attenuators are categorized as redirective and non-redirective. Redirective attenuators are designed to redirect vehicles away from hazards rather than allowing them to crash into the object, which helps mitigate potential damage and injuries. These types of attenuators can move slightly upon impact, guiding the vehicle into a safer trajectory. On the other hand, non-redirective attenuators are intended to absorb and dissipate the kinetic energy of a vehicle impacting the device, but they do not redirect the vehicle. They are typically welded or fixed in place and serve primarily to reduce the severity of crashes without causing the vehicle to change direction.

In understanding why this classification is important, it highlights how each type of attenuator serves a specific safety function within work zones and helps traffic control personnel select the appropriate device based on site conditions and traffic behavior. This classification plays a critical role in designing effective temporary traffic control plans that ensure the safety of both workers and motorists.