What is the primary feature of a major arterial road?

The primary feature of a major arterial road is that it provides regional access. Major arterial roads are essential components of a transportation network as they connect different regions and allow for the efficient movement of large volumes of traffic over long distances. They are designed to facilitate the flow of traffic between various areas, such as from suburbs to urban centers or across different towns.

While other options mention aspects of road functionality, such as city unity and neighborhood boundaries, these are typically more characteristic of local streets or collector roads, which serve different purposes within urban planning. Exclusive access for public transport is also a feature seen in specific transit routes rather than arterial roads in general. High-speed travel with no stops can apply to some arterial roads, but most have intersections and traffic signals to manage the flow of vehicles safely. Therefore, the primary role of a major arterial road centers on its capacity to provide regional access efficiently.