Ontario G1 Test Coach
Safe drivingQuestion 304 of 328

What colour are the flashing lights on a snow plow, and what do they warn you about?

  1. Red; a school bus ahead
  2. Blue; wide and slow-moving vehicles
  3. Amber; a road closed ahead
  4. Green; a vehicle that will turn
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Correct answer: Blue; wide and slow-moving vehicles

Blue lights warn of wide, slow vehicles. A plow wing can reach three metres to the right.

Source: The Official MTO Driver's Handbook (Ontario Ministry of Transportation), Driving at night and in bad weather, Snow plows

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Questions last reviewed: 18 October 2026