Final answer:
When parking downhill on a two-way street, the front wheels should be turned towards the curb, and you should apply the parking brake and leave the vehicle in gear or 'park'.
Step-by-step explanation:
When parking your vehicle headed downhill on a two-way street, you should always ensure your car is parked securely to prevent it from rolling. To do this, the front wheels should be turned towards the curb or side of the road. The idea is to have the vehicle roll into the curb if the brakes should fail, providing an additional measure of security. Furthermore, apply the parking brake firmly, and leave the vehicle in gear or in the 'park' position if it is an automatic transmission. This question does not relate to the physics information provided and instead refers to best practices in vehicle safety when parking on an incline.
When parking your vehicle headed downhill on a two-way street, the front wheels should be turned towards the curb. This is called curb-side parking and helps prevent the car from rolling into traffic if the brakes fail. By turning the front wheels towards the curb, the vehicle will roll towards the curb instead of into the street, reducing the risk of accidents.