247SimpleTests
CDL · General

When fueling a vehicle that is transporting hazardous materials, what safety precaution applies?

Correct answer

Turn off the engine, and someone must be in control of the fueling process at the nozzle; no smoking near the vehicle

  1. A Leave the engine running
  2. B Turn off the engine, and someone must be in control of the fueling process at the nozzle; no smoking near the vehicle
  3. C Smoke while fueling
  4. D Fuel quickly without attention

Why this is the answer

When FUELING a vehicle transporting hazardous materials: TURN OFF the engine; a person must be IN CONTROL of the fueling at the nozzle (attended at all times); NO SMOKING near the vehicle (or open flames/sparks). CDL hazmat. These precautions reduce the risk of fire/explosion (fuel vapors plus a fuel/flammable load is high-risk). GENERAL hazmat safety also includes: NO SMOKING within a set distance of vehicles carrying explosives, flammables, or oxidizers; attending the vehicle for certain materials; following route restrictions. Static electricity and ignition sources are major fueling hazards. Knowing the fueling precautions (engine off, attend the nozzle, no smoking) for hazmat transport is commonly tested.
Source: FMCSA CDL Manual — Hazmat, Fueling Precautions

Practice more questions

This question is from our CDL Practice Tests practice test. Take the full practice test to test your knowledge across all General and other topics.

Take the Hazardous Materials practice test →

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

Related questions

General

Before transporting hazardous materials, what is the driver responsible for checking regarding the shipment?

 General

While transporting explosives (Class 1) or certain other hazardous materials, what restriction commonly applies to the vehicle?

 General

Why must hazardous materials sometimes be segregated (kept separated) during transport?

 General

What does the term 'packing group' indicate for a hazardous material?

State-specific guides

Need information for your state? Our state guides cover local requirements, fees, and what to expect on exam day.

California Texas Florida New York Pennsylvania Illinois Ohio Georgia

Recommended study materials

Study guide

CDL Study Guide 2025–2026 (Trivium)

Complete prep for all CDL written tests: general knowledge, air brakes, combination vehicles, hazmat, and all endorsements. Includes full-length practice tests.

Check Price → Study guide

CDL Practice Tests & Flashcards (Accepted Inc.)

600+ practice questions covering every FMCSA knowledge area, plus 400 flashcards for endorsement prep.

Check Price → Study guide

Master the CDL Truck Driver's License (Arco)

Arco's classic CDL prep with in-depth FMCSA manual coverage, endorsement chapters, and scored practice exams.

Check Price →

As an Amazon Associate, CJ Affiliate, and AWIN publisher we earn from qualifying purchases. Links above are affiliate links. Full disclosure →