A yellow diamond W6-1 sign showing opposing arrows separated by a median symbol warns that:

Correct answer: D. – A divided section of highway begins ahead
The W6-1 Divided Highway sign is placed in advance of a roadway section where opposing traffic will be separated. The separation may consist of a median or another physical barrier. Do not confuse it with the Divided Highway Ends sign, which warns that separated roadways will return to two-way traffic.
Source: Wisconsin Manual on Uniform Traffic Control Devices — Part 2, Ch. 2C, § 2C.20, “Divided Highway Sign (W6-1)”


