When the road is divided into three lanes, the middle lane is primarily for...

The middle lane in a three-lane road configuration is primarily designated for turning right or continuing straight. This lane serves as a transitional area that facilitates smooth traffic flow and allows vehicles to navigate intersections or merge safely without disrupting traffic from other lanes.

By utilizing the middle lane for these purposes, drivers can more effectively manage their routes and reduce the risk of sudden lane changes that can lead to accidents. This setup helps to maintain a structured flow of vehicles, particularly in areas where left turns might cause congestion or where straight-through traffic needs to move unhindered.

Options like turning left only, parking, or overtaking slower vehicles do not reflect the intended use of the middle lane, as these activities are generally conducted in designated areas or lanes that provide safer conditions for such maneuvers.