SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/drive-yellow-diamond-warning

Yellow diamond-shaped signs with black symbols are what type of sign?

Warning signs, a hazard or change is ahead.

  1. Warning ✔
  2. Regulatory
  3. Guide

Why: Yellow diamonds warn you about curves, merges, deer, slippery roads and other hazards ahead. They are not laws, they are heads-ups.

Huh, didn't know that: Work zone warning signs use the same diamond shape but in orange.

The dad joke
Why are warning signs diamonds? Because safety is forever.
Like this card?
Play the game

References

Answer: Warning. Yellow diamonds warn you about curves, merges, deer, slippery roads and other hazards ahead. They are not laws, they are heads-ups.

  1. New York State Driver's Manual, Chapter 4 dmv.ny.gov/new-york-state-drivers-manual-and-practice-tests/chapter-4-traffic-control
    WARNING SIGNS normally are yellow and diamond-shaped, with black 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
    Warns you of specific road conditions and dangers ahead.
    Checked 2026-10-09.
  3. MUTCD 11th Edition with Revision 1, Section 6H.01 mutcd.fhwa.dot.gov/pdfs/11th_Editionr1/mutcd11theditionr1hl.pdf
    TTC warning signs shall be diamond-shaped
    Checked 2026-10-09.

Think this answer is wrong? Tap "Challenge this answer" on the card in the game and tell us why.

Test yourself in the game

Cars & DrivingA white rectangle sign with black letters, like SPEED LIMIT 45, is what kind of sign?Cars & DrivingWhich sign is the only one shaped like an eight-sided octagon?Cars & DrivingA red and white triangle points down at you. What should you do?

That's stuff everyone should know.