What type of plan is characterized by diagonal avenues and a circular layout?

The type of plan characterized by diagonal avenues and a circular layout is the radial plan. This design typically features a central point from which multiple radiating streets or avenues extend outward in a star-like pattern, often arranged around a central public space or landmark. The use of diagonal avenues creates a dynamic intersection of routes, allowing for enhanced connectivity and varied perspectives within the urban landscape.

Radial plans are often associated with significant historical cities and urban developments where a central axis of importance—whether political, cultural, or economic—was emphasized. This planning approach can be traced back to cities like Paris, where the design by Baron Haussmann included wide boulevards radiating from the center.

In contrast, a gridiron plan consists of streets that intersect at right angles, fostering a more uniform and predictable layout, and does not incorporate the diagonal and circular elements associated with a radial plan. An organic plan is more variable and responsive to the natural terrain, lacking the intentional geometry of a radial. The rectilinear plan focuses on main pathways and structures that align with straight lines and right angles, again contrasting with the defining characteristics of a radial plan.