Practice question

What does a Speed Index letter 'G' or 'J' on a heavy truck tire sidewall signify?

  1. The fuel efficiency class of the rubber compound
  2. The maximum altitude where the truck may be driven
  3. The canton of tire origin
  4. The maximum permissible operating speed for that tire (e.g. G = 90 km/h, J = 100 km/h, K = 110 km/h)

Answer: D — The maximum permissible operating speed for that tire (e.g. G = 90 km/h, J = 100 km/h, K = 110 km/h)

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Practice more: Swiss Category C Theory (Truck) Practice Questions - Switzerland Driving Theory Test - Category C (Heavy Motor Vehicles) Exam →