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From Section 8 of the Illinois Commercial Driver’s License Study Guide

Illinois CDL Tank Vehicles Practice Test

Who takes it: every CDL class (A, B and C), for the N endorsement.

Hauling liquids or gases in a tank. 20 questions, 16 right to pass (80%).

Study mode

Practice Tank Vehicles

  • 10questions a round
  • 1manual section
Exam mode

Take the Tank Vehicles test

  • 20questions
  • 16correct to pass
  • –no test taken yet
Section 8 · p. 98–100 of the Illinois Commercial Driver’s License Study Guide (July 2025 (DSD CDL 10.30)), opens in a new tab

A Tank Vehicles question to try

Is the posted speed on a curve safe for a liquid tanker?

Tap an answer to see if you’re right, and the page

Where it is in the Illinois Commercial Driver’s License Study Guide

Your score on each part fills in as you study.

  • Manual section 8
  • Tank vehiclesNot practiced yetp. 98 to 100

The manual says to also study Sections 2, 5, 6 and 9 for this test, so when a practice test needs more questions than this section has, it adds some from those sections.

Illinois answers about this test

CDL Tanker Test guide8 rules, with the pages in each state's manual

Practice material, not the official test: check every answer in your state's current handbook. Disclaimer · How the rounds work · SOS

All Illinois CDL tests