What type of highway is characterized by multiple roadways separated by barriers or spaces?

A divided highway is defined by its configuration of having multiple roadways that are separated by physical barriers or designated spaces. This design is essential for reducing head-on collisions and increasing overall safety by creating clear distinctions between vehicles traveling in opposite directions. By having barriers, it helps to prevent vehicles from inadvertently crossing over into oncoming traffic, providing an added level of security for drivers and passengers alike.

In contrast, other types of roads listed do not possess this specific characteristic. For example, a multi-lane roadway could have multiple lanes but might not be divided by barriers, making it less safe in terms of separating traffic. A circle route typically refers to roadways that facilitate circular travel around an area, and unidirectional roads allow traffic to flow in a single direction, both of which lack the distinct separations that defined the divided highway. Therefore, the unique features and safety benefits of divided highways reinforce the understanding that this is the accurate choice regarding the described type of highway.