What type of highway limits access to ensure uninterrupted traffic flow?

A freeway is designed specifically to facilitate uninterrupted traffic flow by limiting access points. This is achieved through features such as controlled access ramps, which connect to interchanges rather than direct intersections with local roads. The main purpose of a freeway is to allow high-speed travel with minimal stops, reducing congestion and improving safety.

The design of freeways includes multiple lanes in each direction, an absence of at-grade crossings, and separation from other types of roads, which altogether contribute to a smoother and more efficient movement of vehicles. These characteristics are in contrast to local roads and access roads, which typically accommodate traffic at lower speeds, with more frequent access points and interactions with other vehicles, pedestrians, and local traffic.

Thus, the nature of a freeway as a limited access highway makes it the correct answer, as it underscores its primary function of maintaining fast and efficient travel for long-distance vehicle movement.