San Ysidro Roundabout

Highway 101: San Ysidro Roundabout - Completed

Project Overview

The San Ysidro Roundabout improves traffic flow at the intersection at San Ysidro Road, North Jameson Lane, and the northbound Highway 101 on- and off-ramps at San Ysidro Road. This single-lane roundabout has an oval-shaped median planted with native and drought-tolerant landscaping. There are crosswalks around the roundabout with median islands to enable pedestrians to cross one direction of traffic at a time. Bicyclists can either take the lane through the roundabout or dismount and use crosswalks.

Construction occurred from March 2023 through May 2024. This project was delivered early to help local traffic circulation due to local, state, and federal funding.

Roadway Improvements

San Ysidro Roundabout Stage 1A Map
San Ysidro Roundabout Stage Maps

Access through
Construction

Drivers had access through the intersection during construction with the exception of June and July 2023 when the overcrossing over Highway 101 was closed to enable roundabout, bridge rail, and on- and off-ramp construction simultaneously. Please see maps for detailed information and expect day and night work.

Ramp Closures: To enable construction space and reduce traffic in the work area, the northbound on- and off-ramps at San Ysidro Road will have the following closures. Drivers can use detours at Sheffield Drive and Olive Mill Road. Visit www.SBROADS.com to view maps.

Northbound on-ramp: March 2023 - early 2025

Northbound off-ramp: June 2023 - early 2025

Project Timeline

Construction is complete and occurred from spring 2023 through May 2024.

San Ysidro Roundabout timeline showing project duration and road closures

Highway 101: Carpinteria to Santa Barbara is a project undertaken by Caltrans and SBCAG in cooperation with local agencies to add a new carpool lane in each direction between Carpinteria and Santa Barbara. The project will improve bridges, interchanges, on- and off-ramps, and add sound walls.

City of Carpinteria, California County of Santa Barbara, California City of Santa Barbara, California