This road sign means:

A "Divided Highway Ahead" sign warns drivers of an upcoming roadway with a median or physical barrier separating opposing lanes of traffic. When you see this sign, stay to the right of the divider and prepare for one-way traffic flow. Be especially cautious when entering or exiting the divided section, as merging lanes or cross traffic may require adjustments in speed. Always obey posted speed limits and watch for additional signs indicating lane changes or restricted turns.

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