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SESK: Stuff Everyone Should Know · sesk.info/drive-white-rectangle-regulatory

A white rectangle sign with black letters, like SPEED LIMIT 45, is what kind of sign?

Regulatory, it states a law you must obey.

  1. Regulatory ✔
  2. Warning
  3. Advisory

Why: White rectangles are regulatory signs: speed limits, lane use, turns and parking. Breaking them is breaking the law, not just ignoring advice.

Huh, didn't know that: Some regulatory signs use red symbols, like the red circle with a slash meaning something is not allowed.

The dad joke
Why did the speed limit sign break up with the car? It was moving too fast.
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References

Answer: Regulatory. White rectangles are regulatory signs: speed limits, lane use, turns and parking. Breaking them is breaking the law, not just ignoring advice.

  1. New York State Driver's Manual, Chapter 4 dmv.ny.gov/new-york-state-drivers-manual-and-practice-tests/chapter-4-traffic-control
    REGULATION SIGNS normally are white rectangles with black letters or symbols, but some are different shapes, and some can use red letters or symbols.
    Checked 2026-10-09.
  2. California Driver's Handbook, Section 7 www.dmv.ca.gov/portal/handbook/california-driver-handbook/laws-and-rules-of-the-road
    Communicates many important rules you must obey.
    Checked 2026-10-09.

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