Question Most heavy trucks with manual transmissions require ____ to change gears. Answers Single clutching Double clutching Triple clutching Explanation Most heavy vehicles with manual transmissions require double clutching to shift gears. Learning to effectively change gears by double clutching takes practice. This questions appears in the following tests: Delaware Class A Knowledge Test Delaware Passenger Kentucky Class B Knowledge Test Maine Double New Mexico Class B Knowledge Test Rhode Island Passenger South Carolina Class A Knowledge Test South Carolina Double Wisconsin Class B Knowledge Test