Driving theory questions

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What are HA oils?

  • Correct: Carcinogen oils found in some tyres.
  • Incorrect: Environmentally hazardous oils found in the brake system (brake fluid).
  • Incorrect: A type of environmentally friendly motor oil.

Many older tyres contain HA oils, which are among the most common carcinogen products used in society.” (Driving Licence Book, 19th Edition, page 221)


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