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CDL · Driving and Parking

How often must a driver inspect a placarded hazmat vehicle's tires?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

At the start of each trip and each time the vehicle is parked

  1. A Only during the pre-trip inspection
  2. B At the start of each trip and each time the vehicle is parked
  3. C Once per week
  4. D Only when the warning lights illuminate

Why this is the answer

Federal rules require placarded hazmat drivers to examine tires at the start of each trip and each time the vehicle is parked. A leaking, flat, or overheated tire on a hazmat vehicle is a fire risk that can ignite the cargo or release the contents. If a tire is found to be defective, it must be replaced before the trip continues. Use of the spare tire as a temporary fix is allowed within reason, but a damaged tire on a hazmat load cannot be ignored. The rule applies even on short stops and even at fuel stops. The walk-around and tire check that takes two minutes can prevent a roadside fire that ends careers and lives.
Source: FMCSA CDL Manual 9.4.5 Tire Checks

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About this topic: Driving and Parking

Driving and parking with hazmat covers route restrictions, railroad-crossing stops, where you may and may not park with explosives or flammables, attending the vehicle, and what to do in a fire or leak. This is one of 17 Hazardous Materials questions on driving and parking, each with a full explanation on a single study page.

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