When there are two vehicle lanes in the same direction, which lane should drivers use?

The appropriate choice emphasizes the importance of lane discipline when driving on roads with multiple lanes in the same direction. In this context, drivers should use the left lane primarily for traffic, which is a common practice in many countries, including Japan. The left lane is often designated for overtaking or faster-moving vehicles, while the right lane is typically reserved for general traffic or slower-moving vehicles. This practice helps maintain a smooth flow of traffic and enhances safety by allowing faster vehicles to pass more easily.

By using the left lane for faster traffic, drivers ensure that merging and passing maneuvers can be conducted without disrupting the flow of other vehicles. Additionally, adhering to this guideline contributes to overall road safety and efficiency, as it minimizes the likelihood of sudden lane changes or congestion caused by mismatches in speed between vehicles using the two lanes.