Question This sign means: Answers No right turn. Keep right. No U-turn. Left lane must turn left. Explanation Regulation signs regulate traffic speed and movement, displaying rules which drivers must obey. This regulation sign means that right turns are prohibited. Take a FREE Practice Test Now This questions appears in the following tests: Wisconsin Practice Test Colorado Practice Test North Dakota Practice Test Minnesota Practice Test Indiana Practice Test Montana Practice Test Arkansas Practice Test District Of Columbia Practice Test New Mexico Practice Test Arizona Practice Test Wyoming Practice Test New Jersey Practice Test Kentucky Practice Test Rhode Island Practice Test Maine Practice Test Utah Practice Test Washington Practice Test