Question What is a bobtail? Answers A tractor without a semi-trailer A tractor with two semi-trailers A tractor that goes faster than the speed limit A tractor that goes slower than the speed limit Explanation Tractors without semi-trailers are referred to as bobtail tractors. Operating a bobtail tractor requires drivers to exercise caution. Take a FREE Practice Test Now This questions appears in the following tests: Massachusetts Tank , Nevada Tank , Nebraska Combination , New Jersey Combination , West Virginia Combination ,