State Route 227

Los Ranchos Road Intersection Operational Improvements Project

The County of San Luis Obispo Department of Public Works, San Luis Obispo Council of Governments (SLOCOG), and Caltrans are in the preliminary engineering phase of a project to improve operations at the State Route 227 and Los Ranchos Road intersection. To determine the best solution at this intersection, the study team commissioned a detailed traffic analysis of the State Route 227 corridor from Aero Drive to Price Canyon Road, known as the 2021 State Route 227 Corridor Traffic Study.

Project Status

  • October 12, 2021 - Virtual Public Meeting on DRAFT 2021 Corridor Traffic Study. Please register in advance of the meeting to receive meeting details.

  • September 29, 2021 – Draft 2021 Corridor Traffic Study completed.

  • May-June 2021 - Consultant continued efforts on traffic analysis and County is on schedule to present the findings to the community this fall/winter. Conducted public outreach ahead of the DRAFT 2021 State Route 227 Corridor Traffic Study via six focus groups, which included stakeholders that work in emergency response, air quality, agriculture, business, tourism, biking, Los Ranchos Elementary, and affected neighborhoods.

  • July 14, 2020 - The topographic survey, geotechnical explorations, and traffic forecasting is complete. Work continues to analyze each corridor alternatives under current and future traffic volumes. The County hopes to present the findings of the traffic analysis to the community this fall/winter 2021.

  • November 19, 2019 - The San Obispo County Board of Supervisors approved Phase 1 of a professional consultant services contract with Rick Engineering Company.

  • March 20, 2019 - The first townhall meeting was held at Los Ranchos Elementary School. Representatives from the County, Caltrans, and San Luis Obispo Council of Governments (SLOCOG) were present to inform the public about the proposed project and listen to comments and concerns.

  • January 17,2017 – SLOCOG’s State Route 227 Operations Study was adopted. For details, see the Project Background section below.

  • September 15, 2016 - SLOCOG Public Workshop #3

  • May 24, 2016 - SLOCOG Public Workshop #2

  • November 19, 2015 - SLOCOG Public Workshop #1 

Project Timeline

227 Timeline

Project Funding

The Project is funded through federal Congestion Mitigation Air Quality (CMAQ) program funds and State Highway Account (SHA) funds programmed through the San Luis Obispo Council of Governments (SLOCOG).

227 Funding Table

2021 Corridor Traffic Study & Public Meeting

227 report

As part of the preliminary engineering phase of this project, the study team commissioned a detailed traffic analysis of the State Route 227 corridor from Aero Drive to Price Canyon Road to assess the congestion and safety benefits of various project alternatives at high priority intersections, including: Farmhouse Lane, Buckley Road, Crestmont Drive, Los Ranchos Road, and Biddle Ranch Road.

Please join us for a public meeting to learn more about this study!

Virtual Public Meeting: 2021 Corridor Traffic Study Findings with Q&A

October 12, 2021, 6:00-8:00pm

Please register in advance of the meeting to receive meeting details.

Questions about the meeting? Contact SLOCOG Public Information Officer Anna Devers at or (805) 781-4462.

Please see a couple of our simulation videos below. Note that there are many more on SLOCOG’s YouTube channel.

Project Background

227 operational studyIn 2015, the San Luis Obispo Council of Governments (SLOCOG) initiated a corridor study to develop solutions to growing congestion on State  Route 227 between Tank Farm Road and Price Canyon Road. The study included analysis of the following two possible solutions for the corridor:

  1. Widening of State Route 227 to 2-lanes in each direction and upgrading the signals at various intersections

  2. Constructing a series of roundabouts at key intersections

SLOCOG held three workshops during the development of the study to gain input from the public regarding the two alternatives. To improve operations by relieving existing and future congestion, the study recommended constructing a series of roundabouts, starting with Los Ranchos Road as a priority project, followed by Buckley Road. The SLOCOG Board approved the operations study and technical appendices in January of 2017.

Frequently Asked Questions

What are some common myths about roundabouts?


Are roundabouts safer than traffic signals?

Roundabouts are proven to reduce injury and fatal crashes compared to traditional intersections. Roundabouts are effective at slowing down traffic so that when crashes do occur, they usually occur at low speeds and are unlikely to cause injury or major damage. Roundabouts are also able to prevent head-on and T-bone types of crashes.

Where can I find additional information about roundabouts?

All About Roundabouts

Failure to Yield

Improper Lane Use

How to drive through a roundabout

Roundabouts: An Informational Guide

Roundabouts in the United States


Contact SLOCOG Public Information Officer Anna Devers at or (805) 781-4219, or the County Project Manager Genaro Diaz at or (805) 781-5279.

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