Why should a commercial vehicle travel in the right (slower) lane of traffic?

A commercial vehicle should travel in the right lane of traffic primarily because they have longer stopping distances. Larger vehicles, such as trucks and trailers, weigh more and take significantly longer to come to a complete stop compared to lighter vehicles. This characteristic necessitates more space and time to react to traffic conditions, which is best accommodated in the right lane.

By operating in the right lane, these vehicles can better manage safe stopping distances, allowing for smoother traffic flow and making it easier for other drivers to navigate around them, particularly in situations where quick stopping might be required. This precaution helps to reduce the risk of accidents caused by sudden halts and gives other road users clearer expectations of the vehicle's behavior on the road.

While legal requirements, noise pollution, and traffic congestion are relevant factors in traffic management, the fundamental reason for heavy commercial vehicles to travel in the right lane is their need for extended stopping distance, ensuring safety not just for themselves but for all road users.