Before starting down a hill, be sure to: Question Before starting down a hill, be sure to: Answers Accelerate. Switch into a high gear. Sound your horn. Switch into a low gear. Explanation Before starting down a hill, be sure to switch into a low gear. Gravity will increase your vehicle's speed as you travel downhill. This questions appears in the following tests: Arkansas Class B Knowledge Test Connecticut Air Brakes Florida Air Brakes Georgia Class A Knowledge Test Indiana Class A Knowledge Test Kansas Air Brakes Minnesota Air Brakes New Hampshire Class B Knowledge Test New York Double New York Air Brakes Pennsylvania Class B Knowledge Test Pennsylvania Air Brakes South Carolina Class A Knowledge Test South Carolina Class B Knowledge Test Texas Double