What is controlled access?

Answer: D — Highway with traffic signals

Controlled access refers to a type of highway that has limited access points and typically does not have intersections, toll booths, or traffic signals. This allows for smoother and more efficient traffic flow compared to other types of highways, as there are fewer disruptions and potential points of congestion. Therefore, options A, B, and C are incorrect as they describe highways with features that are not typically found on controlled access highways.