California Department of Transportation

Roundabouts Inventory

The California State Highway System (SHS) Roundabouts Inventory compiled by Caltrans provides an inventory of existing, programmed, and planned roundabouts located on the SHS.  The inventory includes examples of where roundabouts have been successfully implemented on the SHS and includes a historical context for the purpose why the roundabout was installed.  This document is a reflection of Caltrans' leadership role in developing project alternatives for at-grade intersections to maximize safety and to improve operations while being sensitive to community needs.  Roundabouts help to maximize safety for drivers, pedestrians, cyclists, and reduce the use of traffic signals while improving mobility. 


The California State Highway System Roundabouts Inventory is now available on the web. The Roundabouts Inventory is available as a portable document file (PDF) that can be viewed or printed. The following website resources are provided to assist you in obtaining roundabout information, planning resources and guidance information:

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