Improving Congestion and Mobility on the 101

Current Projects on the Corridor:

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 can be found at the links below.  

SLOCOG and Caltrans held a pubic hearing on October 20th, 2020 to present information about the project and its impacts. A recording of the meeting and the presentation materials can be found at the links below. For more information about the project contact Stephen Hanamaikai at

Meeting Recording

Public Meeting Presentation

Project Fact Sheet

Soundwall Memo

Truck Climbing Lane Extension-Only Memo

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.

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

Download the Final Plan and Appendices >>

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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