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CDL · Driving Tank Vehicles

A tanker carrying hazardous materials must display placards. What is the purpose of these placards?

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

To identify the hazardous material being transported so that emergency responders know what they're dealing with in case of an accident or spill, and to warn others — placards correspond to hazard classes

  1. A To indicate the tank's capacity
  2. B To advertise the company
  3. C Decoration
  4. D To identify the hazardous material being transported so that emergency responders know what they're dealing with in case of an accident or spill, and to warn others — placards correspond to hazard classes

Why this is the answer

Hazmat placards on tankers: Placards are diamond-shaped signs displayed on all four sides of a vehicle carrying hazardous materials above threshold quantities.

Purpose: Identify the hazard class of the material (so emergency responders can respond appropriately and safely in an accident, fire, or spill); warn the public and other drivers; comply with federal hazmat regulations.

Placard information: Color and symbol indicate the hazard class (e.g., red = flammable, orange = explosive, yellow = oxidizer, white = poison/inhalation hazard); a UN/NA identification number may be displayed.

Hazmat endorsement: Required to haul placarded amounts of hazmat (the H or X endorsement).

Requirements: Proper placarding; shipping papers; emergency response information (ERG); security training; many tankers carry hazmat (fuel, chemicals).

Role: Placards are critical for emergency response — first responders identify the material by the placard before approaching; drivers must ensure correct placarding, carry proper documentation, and know emergency procedures; transporting hazmat in a tanker combines tanker skills with hazmat requirements.

Source: FMCSA CDL Manual — Hazmat Tankers, Placards

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About this topic: Driving Tank Vehicles

Driving a tank vehicle means managing a high centre of gravity and a shifting load: slow for curves well below the posted speed, brake early and smoothly, and never make sudden steering changes. These questions cover the handling rules for liquid loads. This is one of 21 Tanker questions on driving tank vehicles, each with a full explanation on a single study page.

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

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