Question This sign means: Answers A left curve is ahead. A series of curves is ahead. An S-curve is ahead. The road will be slippery when wet. Explanation This sign warns that especially slippery conditions exist when the road is wet. Take a FREE Practice Test Now This questions appears in the following tests: Indiana Practice Test Maine Practice Test Washington Practice Test New Jersey Practice Test Oklahoma Practice Test Alaska Practice Test Minnesota Practice Test District Of Columbia Practice Test Connecticut Practice Test Missouri Practice Test Idaho Practice Test Nevada Practice Test Nebraska Practice Test Rhode Island Practice Test