This road sign means:

Work zone signs identify construction or maintenance areas where workers or equipment may be on or near the roadway. They are normally diamond shaped, like warning signs, but they are orange with black lettering. This sign warns drivers that there is road work ahead, and cautions them to slow down. When driving in construction zones, be alert, adjust your speed to the traffic conditions and increase your following distance. Always obey all instructions provided by signs, traffic signals and flaggers.

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