What is defined as a public open space allowing for continuous flow of pedestrian and vehicular traffic?

The correct choice, defined as a public open space allowing for continuous flow of pedestrian and vehicular traffic, is the road right of way. A road right of way is an area designated for transportation, which is specifically designed to accommodate both vehicles and pedestrians in a safe and efficient manner. This space is critical for connectivity within urban planning, ensuring that people can move freely and that traffic can function without unnecessary interruptions.

In urban environments, road rights of way play a vital role in infrastructure development, facilitating the coexistence of different modes of transportation while also providing access to adjacent properties. This differs significantly from other options. For example, a park is primarily intended for recreational use and does not typically serve as a thoroughfare for traffic. A plaza, while it may allow pedestrian flow, is usually more focused on public gatherings and activities rather than functioning as a defined traffic route. An alley, on the other hand, often serves as a narrow passageway primarily for service vehicles, not typically designed to accommodate continuous flow of both pedestrians and larger vehicles as a road right of way does. Thus, the road right of way best encapsulates the requirement for a public open space that supports ongoing movement for both foot and vehicle traffic.