Sign In

Save progress, earn cars, unlock review.

Ontario · G1 Knowledge Test · G1 · DriveTest (MTO)

Ontario G1 Knowledge Test — G1 Practice Question

Knowledge test administered by DriveTest (MTO) for the G1 licence. 40 questions, 80% to pass.

Province progress 0 / 391
Accuracy —
Rules of the Road

Which of the following can also impair driving under Ontario law?

Show Answer & Explanation
Correct Answer: A. Prescription medications and some over-the-counter drugs

Legal medications — allergy pills, cold medicines, sleep aids, certain prescriptions — can impair driving. Always check the label for 'May cause drowsiness' and ask your pharmacist. Driving while impaired by legal drugs is still a Highway Traffic Act offence.

Why the other answers are wrong

  • B.Only illegal street drugsLegal drugs can also impair driving — the rule is not limited to illegal substances.
  • C.Only alcohol above 0.05Impaired-driving law applies to any substance that affects ability to drive, not just alcohol thresholds.
  • D.Nothing beyond alcohol and illegal drugsThe handbook explicitly lists legal medications as potential impairment sources.

More Rules of the Road Questions

An all-terrain vehicle (ATV) may be driven on a public road in Ontario: After a train has passed a multi-track railway crossing, you should: Signalling a turn or lane change is: When railway crossing gates are lowered or the red lights are flashing, you must stop at least how far from the nearest rail? At an intersection with a stop sign but no stop line, you should stop:

Often Missed
All Ontario Questions Smart Practice Mock Exam Road Signs Guide Driving Rules Most-Missed Questions How to Pass the G1 Knowledge Test