What does a roadway with no center line indicate?

A roadway with no center line typically suggests that it is in a residential area. This design indicates a more informal traffic layout, often found in neighborhoods where vehicles tend to operate at lower speeds and where the road may not be wide enough to necessitate a dedicated middle line. Absence of a center line allows for the flexibility of parking on either side of the road and encourages caution among drivers due to the presence of pedestrians, children playing, and various other residential activities.

In this context, the other options don't apply as clearly. A one-way street often has specific signage or road markings to indicate the allowed direction of travel, which would not necessarily lead to the absence of a center line. While some two-lane roads might lack a center line, many do have one to clearly define the lanes of oncoming traffic. Lastly, highway zones usually have defined lanes with clear markings, including center lines, to facilitate higher-speed travel and reduce the risk of collisions.