Improving Congestion and Mobility on the 101

Current Projects on the Corridor:

U.S. 101 San Luis Obispo South County Congestion Relief Project

This multimodal corridor improvement includes U.S. 101 Pismo Congestion Relief, the Avila Beach Drive Interchange Roundabout, and the full extension of the Bob Jones-City to Sea Trail from Ontario Road to the Octagon Barn in San Luis Obispo. This package of projects work together to reduce traffic congestion, increase travel choices for commuters and visitors, relieves effects of the region's jobs-housing imbalance, and provides community and environmental benefits along U.S. 101 through Pismo Beach, the most highly traveled and heavily congested corridor in San Luis Obispo County. SLOCOG is seeking $63.4 million in state grant funding through the SB 1 Solutions for Congested Corridors Program to construct these projects which would be implemented by Caltrans and the County of San Luis Obispo.  

Nominating agency: SLOCOG

Implementing agency: Caltrans and San Luis Obispo County

Project Fact Sheet

Video - Congestion on US 101 in South SLO County (click image to play)

Note: Video shows traffic from off-peak season

U.S. 101 Pismo Congestion Relief Project

This project will improve operations on southbound U.S. 101 through Pismo Beach during weekday afternoon peak hour traffic and on weekends. The primary feature of the project is a left shoulder part time travel lane, a transportation system management and operational strategy that can address congestion and reliability issues within a constrained right of way in a cost-effective manner.  

The Draft Project Report and Draft Environmental Impact Report are available for review and comment and can be found at the links below.  

The deadline for comments is November 17th, 2020. Comments can be submitted via mail to the address below or via email to

Lara Bertaina
California Department of Transportation
50 Higuera St., San Luis Obispo, CA, 93401

SLOCOG and Caltrans will host a public meeting via Zoom on October 20th to provide information about the project and its environmental impacts.  The presentation slides will be posted to this page the day of the meeting.  A recording of the meeting will be posted to this page 1-2 days after the meeting. For more information about the project contact Stephen Hanamaikai at

Instructions to Participate in Public Meeting (PDF, DOC)

Additional Materials

Public Meeting Presentation

Project Fact Sheet

Studies on the Corridor:

U.S. 101 San Luis Obispo to Santa Maria Multimodal Corridor Plan

The U.S. 101 MCP is a collaboration between Caltrans District 5, SLOCOG, and the Santa Barbara County Association of Governments. The plan will analyze U.S. 101, State Route 227, and the local road networks between Santa Maria and Santa Margarita to discover ways to relieve congestion and improve mobility. The plan seeks to make the existing transportation system more efficient, improve multimodal travel opportunities, and enhance safety. 

Corridor plans will be a key requirement to secure grant funding in the coming years and understanding the community's needs and opinions is vital to the planning process, so we need your help! We are asking you to complete the questionnaire found at the link below.  This survey is meant to inquire about your ideas and concerns about your mobility along, across, and adjacent to U.S. 101, including driving, bicycling, walking, and using public transportation.

US 101 Santa Maria to San Luis Obispo Multimodal Corridor Plan Survey

The survey will close Friday, October 30th, 2020.

Topics addressed in the multimodal corridor plan include:

  • Regional and Interregional Safety

  • Congestion

  • Accessibility

  • Connectivity

  • Active Transportation

  • Healthier Communities

  • Goods Movement

  • Economic Development

  • Land Use Efficiency

  • Air Quality and Emissions Reduction

To learn more about the plan visit the Caltrans web page or see the plan Fact SheetFAQs, and SLOCOG Board presentation.  

If you have any comments or ideas to share contact Kelly McClendon, Caltrans District 5 Senior Transportation Planner, at

2014 US 101 Mobility Study

SLOCOG has sponsored and/or participated in various studies along the corridor for improving access, mobility, and movement throughout the region. The recently completed US 101 Corridor Mobility Master Plan evaluates the US 101 corridor countywide to identify the top regional priorities for multimodal improvements and funding strategies.  It was a regional effort to help establish capital project priorities that meets the needs of SLOCOG, the local agencies, and Caltrans. The US 101 Corridor Mobility Master Plan examines the current conditions, identifies key transportation deficiencies, and analyzes potential improvements on and adjacent to the US 101 Corridor through the San Luis Obispo Region. The master plan used Smart Mobility framework to develop performance based measures to evaluate the corridor and planned improvements using appropriate performance measures.

FULL SLOCOG US 101 Mobility Study Final (Adopted December 2014)

US 101 Mobility Study Addendum

The US 101 Corridor Mobility Master Plan Addendum reflects the latest project and analysis information developed for several advancing projects and ensures that this information is consistent with the latest State planning guidelines governing corridor studies including:

  • Corridor Planning Guidebook (Caltrans, 2018);

  • Comprehensive Multimodal Corridor Plan Guidelines (California Transportation Commission, 2018); and,

  • SB-1 Accountability and Transparency Guidelines (California Transportation Commission, 2018).

2016 US 101 Central Coast CA Freight Strategy

The Central Coast relies on U.S. 101 as the primary transportation artery for the region and the area’s major truck route. While a highly efficient freight route, the route experiences a number of  issues including congestion, safety issues, lack of modal alternatives, truck parking shortages, limited east-west connectivity and other issues that impact mobility of shippers and receivers who support the region’s economy.

This study provides a list of priority strategies that can be used to address the most pressing goods movement problems along the U.S. 101 corridor in the Central Coast. Improvements are multimodal and include projects and programs that address intersecting highways as well as rail infrastructure. Specific funding and implementation strategies are suggested to provide guidance to implementing these strategies.

Click here for the report and appendices >>

Below are additional links to various studies and reports for this corridor.

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