Dumbarton Forward | Operate + Coordinate | Our Work

Dumbarton Forward

Low angle view of the Dumbarton Bridge with the Dumbarton Forward logo on top
John Huseby
Tuesday, June 30, 2020

The Dumbarton Forward initiative will implement a suite of near-term operational and multimodal strategies to address traffic flow, congestion and person-throughput in the State Route (SR) 84 - Dumbarton Bridge - Bayfront Expressway Corridor between I-880 in Fremont and Marsh Road in Menlo Park. The proposed improvements support modes of travel other than single-occupancy vehicles, including strategies to encourage transit use. The specific components of the Dumbarton Forward initiative include:

  • Part-time bus-only lane (a multi-year pilot) to allow authorized bus operators to bypass peak period congestion, resulting in improved transit reliability
  • Dumbarton Bridge Toll Plaza operational improvements to accommodate bus movements without stopping at the toll plaza
  • Bayfront Expressway intersection improvements, including transit signal priority, bus queue jump lanes and an adaptive traffic signal system to reduce delays at the signals
  • Eastbound SR 84 / Thornton Avenue off-ramp reconfiguration to accommodate an additional left-turn lane for added capacity and vehicle storage
  • Relocation of Ardenwood Park-and-Ride bus stops to a location closer to the SR 84 on-ramps for easier access for buses

Part-time bus-only lane goals:

  • Move more people in fewer cars
  • Offer travel time savings that can incentivize mode shift to buses
  • Support public and private express bus and shuttle operations
  • Connect regional employment centers and transit hubs

 For more information, contact Linda Lee at llee@bayareametro.gov.

Key Partners and Stakeholders

Key Partners

  • Caltrans
  • California Highway Patrol
  • Alameda-Contra Costa Transit District (AC Transit)
  • Stanford University
  • Facebook

Key Stakeholders

  • San Mateo County Transit District (SamTrans)
  • Alameda County Transportation Commission
  • San Mateo County Transportation Authority
  • City of Menlo Park
  • City of East Palo Alto
  • City of Redwood City
  • City of Palo Alto
  • City of Fremont
  • City of Newark
  • City of Union City
  • County of San Mateo
  • County of Alameda
  • City/County Association of Governments of San Mateo County


This map represents the proposed project elements along the Dumbarton Forward corridor

This map represents the proposed project elements along the Dumbarton Forward corridor.

Estimated Project Costs

Project Initiation Documentation (PID) $0.7 million
Program Analysis & Evaluation Directorate (PA&ED) $1.6 million
Plans, Specs & Estimate (PS&E) $1.6 million
Construction Management $2.5 million
Construction $19 million
TOTAL $25.4 million

Project Schedule

Project Initiation Documentation (PID) - Completed Fall 2019
Program Analysis & Evaluation Directorate (PA&ED) Late 2020
Plans, Specs & Estimate (PS&E) Spring 2021
Advertise & Award Fall 2021
Construction Late 2022