What is the purpose of the leftmost lane on a multi-lane road?

The leftmost lane on a multi-lane road is primarily intended for passing slower vehicles. This lane, often referred to as the "fast lane," allows drivers to overtake those who are traveling at lower speeds more efficiently. Utilizing this lane for passing is essential for maintaining smooth traffic flow and reducing congestion, as it enables faster vehicles to move safely around slower-moving traffic. It is important for drivers to remember that after passing, they should return to a middle or right lane, as the leftmost lane is not suitable for regular travel at lower speeds.

Parking and stopping for emergencies in that lane would violate road safety regulations and could create hazardous situations. Turning left typically occurs from designated turn lanes or intersections, while the leftmost lane is not intended for this purpose in its function as a passing lane.