Practice question

Idling the engine of an HGV for extended periods is discouraged because:

  1. It damages the clutch
  2. It wastes significant fuel (approximately 2 litres/hour), increases emissions and can cause engine carbon build-up
  3. DVSA prohibits idling for more than 5 minutes
  4. It depletes the DEF/AdBlue fluid rapidly

Answer: B — It wastes significant fuel (approximately 2 litres/hour), increases emissions and can cause engine carbon build-up

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Driver CPC Theory Test (Part 1a) →