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Sloat & Skyline Intersection Alternatives Analysis

Project Introduction

The Sloat & Skyline Intersection Alternatives Analysis seeks to evaluate design options to improve traffic safety and operations where Sloat Boulevard, Skyline Boulevard (CA-35), and 39th Avenue intersect. Sloat Blvd serves as a major east-west connector from West Portal to Ocean Beach and the San Francisco Zoo, as well as serving as the unofficial southern border of the Outer Sunset.

The primary goals of the project include:

  • Improving safety for all road users
  • Increasing visibility of people walking and bicycling and reducing intersection conflict points
  • Improving or maintaining transit and vehicle circulation at the intersection

This project will identify options to make the intersection a more inviting, safe, and comfortable experience for all users.

This project is made possible by the San Francisco County Transportation Authority through a grant of Proposition K Local Transportation Sales Tax Funds.


Safety at the intersection of Sloat Blvd, Skyline Blvd, and 39th Ave in the Outer Sunset is unsatisfactory. Between 2008-2012:

  • 6 people were injured in traffic collisions at the Sloat & Skyline intersection
  • 46 people were injured in traffic collisions within a quarter-mile of the intersection
  • 2 deaths were reported within a quarter-mile of the intersection since 2014


Existing intersection conditions include:

  • 2 pedestrian crossings
  • 4 Muni stops for the 18, 57, and 23 lines
  • Bike lanes to the west of the intersection and sharrows to the east
  • A four-way stop, accompanied by two 'slip' right-turn lanes
  • A speed limit of 35 mph, 5-10 mph greater than other high-use corridors throughout the city


In summer and fall of 2017, SFMTA and San Francisco Public Works partnered to hold five outreach events to gather community members' concerns and perceptions about existing conditions at the intersection of Sloat and Skyline. These outreach events included an event at Java Beach Cafe, a walking audit of the intersection with community members, pop-up events during the week and weekends, and a stakeholder discussion. The feedback and observations we received from those events informed the technical study evaluating the intersection. After our robust public outreach process, three main areas of concern were identified:

1) Pedestrian safety crossing the intersection
2) Bicycle safety moving through the intersection
3) Vehicle speeds approaching and moving through the intersection

Additional summary of comments heard include:

  • Crossing the intersection by foot is indirect
  • People driving do not always respect traffic laws
  • People walking actively avoid using the intersection
  • People bicycling find the intersection confusing with no clear path of travel
  • People driving often approach the intersection too quickly
  • Posted speed limits seem higher than what should be allowed


Staff are currently working with a consultant team to evaluate existing conditions against two high-level design concepts — one considering adding a traffic signal at the intersection, the other a roundabout. Since two of the three legs of the junction are under Caltrans jurisdiction, staff are engaging state traffic engineers to evaluate these design concepts. This evaluation process is on-going through mid 2021. Once the trade-offs of the traffic signal and roundabout concepts have been detailed, SFMTA staff look forward to sharing the specific pros and cons of possible design alternatives with the public later in 2021.


Project Timeline 
Preliminary outreach
Develop design concepts
Evaluate design concepts
Further outreach and design
Project Status
SFMTA walking icon
Improved safety and comfort of crossing the intersection on foot
SFMTA bike icon
Improved safety and comfort of crossing the intersection by bike
SFMTA Drive and Parking icon
Improve traffic flow and intersection navigability
Sloat Blvd., Skyline Blvd., 39th Ave.
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San Francisco County Transportation Authority logo