Practice question

What is the minimum tread depth for front steering tires on buses, trucks, or tractors with a GVWR of 4,500 kg or higher?

  1. 1.6 millimetres
  2. 2.0 millimetres
  3. 3.2 millimetres
  4. 4.5 millimetres

Answer: C — 3.2 millimetres

Context The answer is incorrect because it is above the minimum tread depth requirement for front steering tires on vehicles with a GVWR of 4,500 kg or higher. The minimum tread depth for these types of vehicles is 3.2 millimetres. Incorrect answer A: 1.6 millimetres is below the minimum tread depth requirement for front steering tires on vehicles with a GVWR of 4,500 kg or higher. This tread depth is not safe for these types of vehicles and may cause accidents on the road. Incorrect answer B: 2.0 millimetres is also below the minimum tread depth requirement for front steering tires on vehicles with a GVWR of 4,500 kg or higher. This tread depth is not safe for these types of vehicles and may cause accidents on the road. Incorrect answer D: 4.5 millimetres may

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