157.When driving on national freeways, you often see 'attenuator trucks' with large yellow crash cushiondevices mounted at the rear. Which of the following statements about the function and purpose ofattenuator trucks is correct?
(A) It is a mobile barrier designed to protect construction workers andaccident responders from being directly struck by out-of-control vehicles.
(B) Attenuator trucks onlyappear at nighttime construction zones.
(C) Attenuator trucks can absorb 100% of the impact force, so itis fine to collide with one.