Final answer:
When parked on a hill without a curb, turn your wheels towards the ditch or road shoulder (right) and use the parking brake to prevent the vehicle from rolling into traffic.
Step-by-step explanation:
When you are parked on a hill without a curb, it is essential to use certain techniques to ensure that your vehicle does not roll away. If you are parking uphill, turn your front wheels so that if the vehicle starts to move, it will roll away from traffic or into the ditch. Specifically, turn your wheels to the right (towards the road shoulder) so the back end of the car is lower than the front. If you are parking downhill, you should also turn your wheels to the right, facing the road shoulder, so that if the vehicle moves, it heads into the ditch, not into traffic. Always remember to set your parking brake as an additional safety measure regardless of the direction you are parked.