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SESK: Stuff Everyone Should Know · sesk.info/cdl-inspect-warning-triangles

How many red reflective warning triangles should be in a commercial vehicle's emergency equipment?

3 triangles.

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  1. 3 ✔
  2. 2
  3. 6

Why: Emergency equipment includes a fire extinguisher, spare fuses unless the truck has circuit breakers, and warning devices: 3 red reflective triangles, 6 fuses, or 3 liquid burning flares.

Huh, didn't know that: The fire extinguisher must be properly charged and rated.

The dad joke
Why did the triangle get the safety job? It always had the right angle.
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References

Answer: 3. Emergency equipment includes a fire extinguisher, spare fuses unless the truck has circuit breakers, and warning devices: 3 red reflective triangles, 6 fuses, or 3 liquid burning flares.

  1. California Commercial Driver Handbook (DMV) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    3 red reflective triangles, 6 fuses, or 3 liquid burning flares.
    Checked 2026-10-10.

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