Improving Congestion and Mobility on the 101

Current Projects on the Corridor:

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

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)

SLOCOG is working with agency partners to address consistent congestion on US 101 in the Pismo Beach area. The US 101 San Luis Obispo Multimodal Corridor Program represents a package of planned projects seeking funding from SB 1 to improve mobility and travel choices.

Note: Video shows traffic from off-peak season

Studies on the Corridor:

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).

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

Caltrans has partnered with SLOCOG, member agencies, local stakeholders and other advocates to develop a multimodal corridor plan for U.S. 101 between State Route 58 and Santa Maria. The plan will help establish a unified vision for the corridor as one complete transportation system connecting communities, jobs, services, and healthy lifestyles.

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

Corridor plans will be a key requirement to secure grant funding in the coming years and the community's input is vital, so we need your help!    

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

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

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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