Final answer:
When parking uphill on a hard curb, turn your wheels to the left. This will help prevent your vehicle from rolling down the hill if the brakes fail.
Step-by-step explanation:
When parking uphill on a hard curb, you should turn your wheels away from the curb. This means you should turn your wheels to the left.
By turning your wheels away from the curb, it will help prevent your vehicle from rolling down the hill if the brakes fail. The slope of the hill will guide the vehicle away from the curb and towards the center of the road.
Remember, the rule of thumb is 'Uphill - Away.' So if you're parking uphill on a hard curb, turn your wheels to the left.