• The roundabout will be approximately 130 feet in diameter. It includes crosswalks and shared-use paths to accommodate pedestrians and bicyclists.
• The roundabout will be designed to the allowable California legal truck length (65-foot maximum length). 
• Construction is estimated to take about 6 months to complete. During construction, traffic will be handled by one way traffic control for each direction. 

The Need: 

The initial Traffic Investigation Report (October 1, 2010, to September 30, 2013) identified six
correctible collisions within a 1-year period. The latest 5-year collision data (January 1, 2020, to
December 31, 2024) at the project location continues to show that "broadside" collisions are the predominant type and "failure to yield" is the leading primary collision factor. These findings
continue to justify a safety improvement project to address the identified deficiencies.

Project Overview:

This project location had a concentration of collisions for investigation. Caltrans investigated and proposed signal and roundabout installation as alternatives for intersection improvement and identified a single-lane roundabout as the preferred alternative.

The roundabout will improve accessibility for bicyclists and pedestrians while providing better safety performance, meaning the roundabout will lower the rate of future collisions. The roundabout should increase safety by:

• reducing collision severity by decreasing the number of conflict points,
• lowering vehicle speeds,
• simplifying driver decision-making,
• decreasing broadside or head-on type conflict.

The roundabout will also significantly reduce right-of-way impacts compared to the signalized alternative, which would require additional widening to accommodate separate right-turn, through, and left-turn pocket lanes.  Another benefit of the roundabout is that the vehicles consistently go slower on a roundabout, minimizing excessive braking and engine noise. Roundabouts also need significantly less ongoing maintenance than signalized intersections. Roundabouts operate without signal equipment, electrical systems, or detection infrastructure. The result is lower maintenance costs, fewer equipment failures, and increased reliability. Additionally, the roundabout operation is not affected during power outage.

Roundabouts are successful in both urban and rural environments. Many communities favor them for their safety and operational benefits. The nearby SR 116/SR 121 roundabout is a successful experience, which has been operating effectively since late 2025.

Schedule: 

• Draft Environmental Document: Released on November 7, 2025.
• Public Comment Period: Expired on December 8, 2025.
• Final Environmental Document: Signed on February xx, 2026.
• Project Approval: Approved on February xx, 2026.
• Design Phase: Anticipated to begin in Spring 2026. During this phase, detailed engineering plans and construction specifications will be prepared.
• Right of Way (if required): Any necessary right-of-way coordination or utility adjustment will occur in parallel with the final design.
• Construction Start: Anticipated in Spring 2028.
• Construction end: Anticipated in Fall 2028.

Map of the Project Area: 

The environmental comment period is CLOSED. The project environmental document is finished and the team is incorporating comments, per CEQA.