Question Which type of vehicle is most prone to the “crack-the-whip” effect? Answers A five-axle tractor semi-trailer A three-axle tractor semi-trailer A bobtail tractor A triple trailer Explanation Triple combination trailers are most vulnerable to the "crack-the-whip" effect. Take a FREE Practice Test Now This questions appears in the following tests: Pennsylvania HazMat , Florida Combination , New Jersey Combination , North Dakota Combination , Wisconsin Combination ,