Ontario Class D Practice Test · Question
During a pre-trip inspection, you notice that a tire on your straight truck has a tread depth measurement of 1.5 mm. What action should you take?
The minimum legal tread depth for commercial vehicle tires (excluding steering axle tires, which have a higher minimum) in Canada is generally 1.6 mm (1/16 inch
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Question: During a pre-trip inspection, you notice that a tire on your straight truck has a tread depth measurement of 1.5 mm. What action should you take?
Answer options:
- Plan to replace it at the end of the work week
- This is acceptable for commercial vehicles ✅ Immediately replace the tire as it is below the minimum legal tread depth for commercial vehicles
- Inflate it to maximum pressure and continue driving
Correct answer: Immediately replace the tire as it is below the minimum legal tread depth for commercial vehicles
Explanation: The minimum legal tread depth for commercial vehicle tires (excluding steering axle tires, which have a higher minimum) in Canada is generally 1.6 mm (1/16 inch). A tire with 1.5 mm tread depth is below this legal minimum and must be replaced. (National Safety Code Standard 11, Out of Service Criteria)
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Question explanations
- When performing a pre-trip inspection, what is the minimum air pressure required in an air brake system before
- When driving a straight truck, how should you pass a pedestrian walking on the shoulder of the road without a
- Scenario 1: Tare weight refers to:
- Scenario 2: Gross combination weight (GCW) is:
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