Question Rearward amplification refers to: Answers The amount of noise projected to the rear of a vehicle. The cause of the "crack-the-whip" effect. The number of trailers that can be pulled by a tractor. Explanation Vehicles with trailers are vulnerable to rollover due to the "crack-the-whip" effect, which is caused by rearward amplification. Take a FREE Practice Test Now This questions appears in the following tests: Arkansas Tank , Idaho Combination , New Mexico Combination , Oklahoma Combination , Oregon Combination , Tennessee Combination , Vermont Combination ,