When there are three or more lanes going in one direction, the left lane is primarily used for what purpose?

The left lane in a multi-lane roadway, especially when there are three or more lanes going in one direction, is primarily designated for faster-moving traffic and for vehicles that intend to make a left turn. This is because the left lane typically allows for overtaking slower vehicles, providing a smoother flow of traffic for those traveling at higher speeds. Moreover, in many driving scenarios, it is considered the passing lane, where drivers can legally pass vehicles that are traveling more slowly in the right lanes.

Vehicles in the left lane are expected to maintain a higher speed, which facilitates efficient movement on the road and minimizes disruptions caused by slower vehicles. Thus, identifying the left lane's primary purpose as for going faster or making left turns aligns with established traffic rules and best practices for roadway safety and efficiency.