Final answer:
When driving on a road designed for one-way traffic, you should keep to the right to ensure safe and smooth traffic flow.
Step-by-step explanation:
When driving on a road designed and posted with signs for one-way traffic, you should keep to the right.
This is because one-way roads are designed for vehicles to travel in one direction only, and keeping to the right side ensures smooth and safe traffic flow. By following this rule, you can avoid accidents and maintain order on the road.
This helps ensure smooth traffic flow and reduces the risk of head-on collisions. However, local traffic laws may have specific requirements, so it's important to follow any posted signs or road markings that may indicate a preferred or mandatory lane position.