What is the primary purpose of principal arterial roadways?

The primary purpose of principal arterial roadways is to carry large amounts of traffic over long distances. These roadways are designed to enable efficient movement of vehicles, facilitating inter-city or regional travel. They serve as major routes that connect different areas, often linking population centers and major destinations, which is essential for maintaining a comprehensive transportation network.

While other roadway types, such as local streets and minor arterials, play vital roles in providing access and connectivity on a smaller scale, principal arterial roadways focus predominantly on throughput and mobility rather than accessibility. Their design typically prioritizes speed and volume, often incorporating features such as higher speed limits and fewer intersections to minimize disruptions, making them critical in managing long-distance traffic efficiently.