Question This road sign means: Answers Intersection ahead. Steep grade ahead. Winding road. Explanation Warning signs are usually yellow with black markings. This sign indicates that there is a steep hill ahead. Slow down and be ready to shift to a lower gear to control your speed and protect your brakes from damage. Take a FREE Practice Test Now This questions appears in the following tests: Alabama Practice Test Idaho Practice Test Ohio Practice Test Kansas Practice Test Wisconsin Practice Test Tennessee Practice Test South Carolina Practice Test