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Ontario Class B (Bus) Commercial Licence Practice Test 4

  • Based on 2026 ON commercial driver's licence manual
  • Updated for January 2026
  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Triple-checked for accuracy

Welcome to Practice Test 4, a critical step in your journey to obtaining a Class B license in Ontario. This test consists of questions aimed at preparing you for emergency situations, like brake failure. Did you know that Class B license holders in Ontario are not allowed to operate vehicles with air brakes unless specifically permitted? So, understanding alternative safety measures is crucial. Aim for a passing score of 80% or above.

Pass the first time with Premium
ON driver's license
  • Based on 2026 ON commercial driver's licence manual
  • Perfect for first-time and renewal commercial applicants, and those adding endorsements

Reviewed for legal and handbook accuracy

Steven Litvintchouk

M.S. (MIT), Chief Educational Researcher (ACES member)

Test design and learning experience oversight

Andrei Zakhareuski

Co-founder & CEO, 15+ years in driver education

Questions are created and maintained by the Tests.ca content team following our multi-layer editorial process and updated whenever the Ontario government changes its handbook or website information.

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