Final answer:
The correct answer is option 2, 'When parked on a hill or sloping driveway.' In this scenario, you should turn your wheels to prevent the car from rolling if the brakes fail.
Step-by-step explanation:
The correct answer is option 2: When parked on a hill or sloping driveway. When you park on an incline, the way you position your wheels can help prevent your car from rolling down the hill if the brakes were to fail. On a steep hill, if you are facing uphill, turn your wheels away from the curb and let your vehicle roll back a bit until the front wheel gently touches the curb. If facing downhill, turn your wheels towards the curb. For option 1, your wheels should indeed be straight while waiting to make a left turn to avoid being pushed into oncoming traffic if hit from behind. In option 3, when there is no curb, you should still keep the wheels straight to keep the vehicle in its lane.
By turning your wheels, the curb or shoulder will act as a safety barrier.
When waiting to make a left turn at a traffic light (option 1), your wheels should be kept straight ahead. This allows for a smooth and safe turn without interfering with the flow of oncoming traffic. When parked on the side of a level roadway where there is no curb (option 3), you should also keep your wheels straight ahead to prevent the vehicle from rolling if the brakes fail.