Why does a driver towing a trailer keep to the right on a three-lane highway?

When a driver is towing a trailer on a three-lane highway, keeping to the right lane is essential due to the slower speed of the vehicle and trailer combination compared to other traffic. Towing additional weight typically requires more time to accelerate and decelerate, making these vehicles less responsive. As a result, they can impede the flow of traffic if they venture into the left lane, which is generally intended for faster-moving vehicles.

Additionally, by maintaining a position in the right lane, the driver ensures that faster vehicles can safely pass on the left, promoting a smoother and safer traffic experience for everyone. This practice not only adheres to safe driving habits but also aligns with the rules of the road that advocate for slower vehicles to remain in the right lane to facilitate the efficient movement of traffic.