This report summarizes 20 Alternative intersections and interchanges (AII) forms and a framework for considering the connected and autonomous vehicles (CAV) infrastructure needs of a given design. Practitioners in the concept or feasibility design stages can use the information contained in this synthesis to identify common advantages and challenges of intersection forms and consider the additional infrastructure that may assist CAVs in navigating an intersection. The document provides numerous resources for practitioners to find additional, expanded design guidance for many of the forms.

Recommended citation: Federal Highway Administration, Synthesis of Alternative Intersection Forms (Washington, DC: 2024)
https://doi.org/10.21949/1521762