Practice question

On the Ohio CDL Combination Vehicles test, the combination of which two trailer dash controls should you fully understand before driving?

  1. Trailer air supply (red, 8-sided) and parking brake (yellow, diamond-shaped)
  2. Wiper switch and cruise control
  3. Radio and HVAC
  4. Gear selector and turn signal

Answer: A — Trailer air supply (red, 8-sided) and parking brake (yellow, diamond-shaped)

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