What does a sign with a white message on a black background indicate?

• It is used to indicate lane control.
  Explanation:

  "Signs with white lettering on a black background are lane control signs. They provide instructions on how specific lanes should be used, such as turn-only lanes, reversible lanes, or lanes restricted to certain types of vehicles."
• It provides information about a construction zone.
• It warns drivers about potential hazards or road conditions.
• It indicates the presence of a school zone.