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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.

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Accuracy —
Road Signs

A low clearance sign above an overpass shows:

Ontario road sign — The maximum safe vehicle height in metres
Show Answer & Explanation
Correct Answer: B. The maximum safe vehicle height in metres

A low clearance sign lists the maximum vehicle height (e.g., '3.8 m') that can safely pass under the structure. Truck and RV drivers must check their loaded height; a miscalculation tears off the top of the vehicle and damages the structure.

Why the other answers are wrong

  • A.The speed limit on the overpassOverpass speed is not shown by clearance signs.
  • C.The minimum following distanceFollowing distance is not posted on a structure.
  • D.The overpass lengthLength of the overpass is not what this sign conveys.

More Road Signs Questions

A sign with a left-pointing arrow covered by a red circle and slash means: You missed your exit and a 'No U-turn' sign is posted at the next intersection. The safest legal way to turn around is to: A sign showing a curved arrow doubling back, with a red circle and slash over it, means: You are behind a slow-moving farm tractor on a two-lane rural road. You see a 'Do Not Pass' sign. A long straight stretch appears ahead. What should you do? Which sign most commonly indicates that a road is one-way?

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