In Ohio, what does a solid white line alongside a traffic lane typically indicate?

A solid white line alongside a traffic lane primarily indicates that lane changes are discouraged. When you see a solid white line, it signifies that crossing that line to change lanes is not recommended, often because it can cause unsafe conditions. This type of marking helps maintain a smooth flow of traffic by encouraging drivers to stay within their current lane unless absolutely necessary.

In contrast, the other options do not accurately describe the meaning of a solid white line. While a solid white line may be present in areas with same-direction traffic, its primary emphasis is on discouraging lane changes rather than traffic separation. Lane changes are permitted in certain circumstances when there are dashed lines, and a solid white line does not mark the end of a lane; that would typically be indicated by other traffic markings or signs.