SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cdl-hazmat-tunnels-routes

When your truck is placarded, what should you avoid when choosing a route?

Crowds, tunnels, narrow streets and alleys.

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  1. Interstate highways
  2. Crowds, tunnels and narrow streets ✔
  3. Weigh stations

Why: Whenever placarded, avoid heavily populated areas, crowds, tunnels, narrow streets and alleys. Take other routes even if they are less convenient.

Huh, didn't know that: For Division 1.1 to 1.3 explosives, the carrier gives you a written route plan to follow.

The dad joke
Why did the GPS love truckers? They always took the long way to its heart.
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References

Answer: Crowds, tunnels and narrow streets. Whenever placarded, avoid heavily populated areas, crowds, tunnels, narrow streets and alleys. Take other routes even if they are less convenient.

  1. California Commercial Driver Handbook (DMV) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    Whenever placarded, avoid heavily populated areas, crowds, tunnels, narrow streets, and alleys.
    Checked 2026-10-10.

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Test yourself in the game

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