Question This sign means: Answers Curve ahead. Roadwork ahead. Merging traffic. No left turn. Explanation Warning signs prepare drivers for upcoming road conditions and hazards and are usually yellow with black markings. This sign alerts drivers to an upcoming curve in the road. Take a FREE Practice Test Now This questions appears in the following tests: New Hampshire Practice Test Virginia Practice Test Maine Practice Test Hawaii Practice Test Idaho Practice Test Montana Practice Test Washington Practice Test North Carolina Practice Test Indiana Practice Test Pennsylvania Practice Test Ohio Practice Test Nevada Practice Test Michigan Practice Test Oregon Practice Test Rhode Island Practice Test New Jersey Practice Test Florida Practice Test Colorado Practice Test Wisconsin Practice Test Iowa Practice Test Texas Practice Test Utah Practice Test West Virginia Practice Test North Dakota Practice Test Missouri Practice Test Vermont Practice Test Minnesota Practice Test Massachusetts Practice Test Louisiana Practice Test