Overview

An image of cars, bicyclists, pedestrians, and buses at Harrison & 7th streets

Introduction

There are many intersections in San Francisco’s South of Market neighborhood where freeway on- or off-ramps intersect city streets. Many of these ramps are located close to public schools, single room occupancy hotels, and senior centers, which are frequented by populations at high risk of injury from traffic collisions.

The Transportation Authority has been studying how to improve safety at 15 of these intersections with support from Caltrans and the SFMTA. The goal of these studies is to improve safety for all travelers, especially the most vulnerable populations, and to support progress towards the City's Vision Zero goal to eliminate traffic fatalities by 2024.

Freeway Ramp Intersections in SoMa

There are 22 intersections in SoMa where freeway on- or off-ramps intersect city streets. This map shows all of the projects and plans that are underway at each of these intersections. The Transportation Authority has been working to improve safety at 15 of these intersections. The remaining seven intersections are part of planning efforts led by other local agencies.

Image
A map of SoMa freeway ramp intersections

Timeline and Status 

Freeway Ramp Intersection Safety Study 1

The Transportation Authority and the SFMTA developed recommendations for improving safety at five initial intersections. The study was initiated in May 2016 and completed in early 2018. The SFMTA is including improvements at these intersections in its latest five-year Capital Improvement Program update.

Recommended design improvements (PDF)

Final report: Freeway Ramp Intersection Study 1, 2018 (PDF) and Appendices (PDF)

Freeway Ramp Intersection Safety Study 2

The Transportation Authority and the SFMTA are developing recommendations for improving safety at 10 additional SoMa intersections. This study was initiated in 2018 and will be complete in mid-2019.

We received feedback from nearly 1,000 residents, businesses, and community organizations through an open house, online survey, stakeholder meetings, and on-the-ground outreach. After sharing our proposals, we refined and analyzed the improvements based on the study goals and community feedback.

Recommended design improvements (PDF)

Draft study report (PDF) and Appendices (PDF)

Some of these upgrades, such as improved striping and signage, can be implemented within the next two years. Meanwhile, we will work with partner agencies to secure funding and Caltrans design approvals for the more significant infrastructure upgrades we’ve recommended.

We will present these proposals and a draft study report at our Citizens Advisory Committee meeting on Wednesday, June 26. The San Francisco County Transportation Authority Board will consider adoption of the report at its meeting on Tuesday, July 9. View information on upcoming meetings.

Cost and Funding 

Freeway Ramp Intersection Study 1

The study was funded in part by the Transportation Authority's Neighborhood Program.

Freeway Ramp Intersection Study 2

This study was funded by a Caltrans Sustainable Transportation Planning Grant and San Francisco’s half-cent sales tax for transportation.

Contact

Colin Dentel-Post, Senior Planner, SoMa-ramps@sfcta.org

Key features

Intersection Selection

We selected 15 intersections where freeway on- or off-ramps intersect city streets based on three key factors: 

Emphasis on safety: We prioritized intersections with high collision rates. 

Coordination with other agencies: We focused on intersections that aren’t already being addressed by other City plans and projects. 

Proactive approach: Some intersections did not have reported collisions, but were selected because they have opportunities for proactive safety improvements (e.g. new or upgraded crosswalks).

Freeway Ramp Intersection Study 1

The Transportation Authority and the SFMTA have developed recommendations for improving safety at the following five freeway ramp intersections in SoMa.

  1. 5th Street and Harrison Street (I-80 westbound off-ramp)
  2. 5th Street and Bryant Street (I-80 westbound on-ramp)
  3. 8th Street and Harrison Street (I-80 westbound off-ramp)
  4. 9th Street and Bryant Street (U.S. 101 northbound off-ramp)
  5. 10th Street and Bryant Street (U.S. 101 southbound on-ramp)

Recommended Design Improvements (PDF)
Final report: Freeway Ramp Intersection Safety Study 1, 2018 (PDF)

Freeway Ramp Intersection Study 2

The Transportation Authority received Caltrans grant funding to evaluate 10 additional ramp intersections in SoMa. The Transportation Authority and SFMTA are currently studying the additional intersections and developing recommendations for improving safety at these intersections.

The study intersections include: 

  1. Mission, Otis, Duboce, & 13th streets (U.S. 101 northbound off-ramp) 
  2. South Van Ness Avenue & 13th Street (U.S. 101 southbound on-ramp) 
  3. 8th Street between Bryant & Harrison streets (I-80 westbound off-ramp) 
  4. 8th Street & Bryant Street I-80 eastbound on-ramp)
  5. 7th Street & Harrison Street (I-80 westbound on-ramp)
  6. 7th Street between Bryant & Harrison streets (I-80 eastbound off-ramp)
  7. 7th Street & Bryant Street (I-80 eastbound off-ramp)
  8. 6th Street & Brannan Street (I-280 northbound off-ramp, I-280 southbound on-ramp)
  9. Fremont Street between Howard & Folsom streets (I-80 westbound off-ramp)
  10. Harrison Street & Essex Street (I-80 eastbound on-ramp)

Over a recent five-year period, these 10 intersections have had more than 135 collisions, of which 9 had severe injuries. In addition, all 10 intersections are on the San Francisco's Vision Zero high-injury network of streets in the city that have disproportionately high numbers of traffic injuries and fatalities.
Improvements 

Proposed improvements for the 10 intersections include bulb-outs, signal improvements, crosswalk upgrades, striping improvements, and more. We are focusing primarily on  near-term improvements that could be on the ground in the next few years, although some bigger ideas might take longer to plan and implement.

 

Recommended improvements (PDF)

Draft study report (PDF) and Appendices (PDF)

Background

The SoMa Freeway Ramp Intersection Safety Studies follow previous Transportation Authority involvement in efforts to improve safety at SoMa freeway ramps.

Before Freeway Ramp Intersection Safety Studies 1 and 2, the Transportation Authority led design and construction of the Folsom Street Off-Ramp project to realign the I-80 off-ramp to Folsom Street in collaboration with Caltrans, the SFMTA and SF Public Works, the Transportation Authority led design and construction of the Folsom Street Off-Ramp project to realign the I-80 off-ramp to Folsom Street.

The new off-ramp features safer conditions for pedestrians while creating a significantly more valuable parcel of land that allowed for development of new retail space and housing, more than one-quarter of which is affordable.

The realigned Folsom Street off-ramp allowed for the creation of a new crosswalk, designed to help the flow of pedestrians in an increasingly residential area of downtown. The new crosswalk, which allows pedestrians to cross the off-ramp where it meets Fremont Street, has an actuated pedestrian crossing phase. A pedestrian seeking to cross the off-ramp uses a push-button to activate the pedestrian crossing signal while the off-ramp traffic has a red signal. At all other times, the off-ramp traffic will have a green signal.

The new off-ramp reopened to traffic in 2015. Freeway Ramp Intersection Study 2 has since recommended the addition of further treatments to the new off-ramp intersection to further improve safety and pedestrian access.

Public engagement

Freeway Ramp Intersection Safety Study 1

This study is complete. 

Freeway Ramp Intersection Study 2

We launched this study in spring 2018 and received feedback from nearly 1,000 residents, businesses, and community organizations through an open house, online survey, stakeholder meetings, and on-the-ground outreach. After sharing our proposals, we refined and analyzed the improvements based on the study goals and community feedback.

Recommended improvements (PDF)

Draft study report (PDF) and Appendices (PDF)

Some of these upgrades, such as improved striping and signage, can be implemented within the next two years. Meanwhile, we will work with partner agencies to secure funding and Caltrans design approvals for the more significant infrastructure upgrades we’ve recommended. We will present these proposals and a draft study report at our Citizens Advisory Committee meeting on Wednesday, June 26.The San Francisco County Transportation Authority Board will consider adoption of the report at its meeting on Tuesday, July 9. View information on upcoming meetings.

Get email updates on this project

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