Why should you turn your vehicle’s front wheels to the left when parking facing uphill on the right side of a street with a curb?

• To prevent the vehicle from rolling into traffic if it moves.
  Explanation:

  "When parking facing uphill on a street with a curb, turning the front wheels to the left ensures that if the vehicle rolls, it will move away from traffic and be stopped by the curb. This adds an extra layer of safety in case the parking brake fails."
• To assist in shifting the vehicle into parking gear.
• To allow the vehicle to roll into traffic if it moves.
• To act as a substitute for the parking brake.