What is true about the extreme right lane on a highway?

The extreme right lane on a highway is typically designated for slower traffic. This lane serves a crucial function, as it allows larger vehicles, such as trucks, buses, and other slower-moving vehicles, to operate without disrupting the flow of faster-moving traffic in the left or center lanes. By utilizing the right lane for slower vehicles, it enhances safety and prevents congestion, as faster vehicles can use the adjacent lanes to pass more efficiently.

Other uses of the right lane, such as for making right turns or for emergency vehicles, are additional considerations but do not encompass the primary purpose of the right lane being for slower traffic. While it is true that vehicles turning right may also use this lane, the overall function maintains an emphasis on keeping slower-moving vehicles in this lane to facilitate smoother traffic flow across the highway.