Which lane should slower moving vehicles use on a multi-lane highway?

Slower moving vehicles should use the right hand lane on a multi-lane highway because this practice promotes safety and efficiency in traffic flow. The right lane is typically designated for vehicles traveling at lower speeds, allowing faster vehicles to use the left lanes for passing. This arrangement minimizes the risk of accidents as it facilitates smoother transitions between different speeds of traffic. Furthermore, it helps reduce congestion in the left lanes, where faster vehicles prefer to operate, thus maintaining a steady flow for all road users.

Using the right lane also aligns with traffic laws in many regions, which encourage slower vehicles to keep to the right to enhance road safety. The shoulder of the road is not intended for regular travel and is reserved for emergencies, while the middle and left lanes are primarily for overtaking faster-moving traffic. Hence, maintaining the right lane for slower vehicles optimizes overall traffic dynamics.