The Treasure Island Mobility Management Authority (TIMMA) recently completed the Treasure Island Mobility Management (TIMM) Study and presented its recommendations to the TIMMA Board comprised of the San Francisco Board of Supervisors during the July 2016 meeting. The report was adopted by the board.

Download the TIMM Study final report (4.7MB PDF).

The appendices are not included in the document but are available for download here:


The study generated a number of recommendations for the tolling program on Treasure Island/Yerba Buena Island. The tolling program is needed to pay for a significant increase in transportation options to get to, from and around Treasure Island/Yerba Buena Island and to manage increased traffic on the Bay Bridge. The following toll policies were recently approved:

Who pays the toll

  • Residents and non-residents will pay the toll.

Which directions are tolled

  • Both directions will be tolled (both to and from Treasure Island).

Driving trips that are given a discount or surcharge on the toll

  • Credit will be given to westbound drivers for tolls paid at the Bay Bridge toll plaza.
  • During a transition period, credit will be given to longtime households of all income levels by subsidizing the cost of one daily round-trip toll.
  • For each trip made on transit, residents who qualify for Below-Market-Rate (BMR) units can accumulate toll credit as part of the proposed Transportation Affordability Program (TAP).

Driving trips that are exempt from the toll?

  • Registered transit, shuttles, and vanpools, as well as pedestrian and bicycle trips, will be exempt from the toll.


The study also provides some policy advisories that need further research and development before an approval action is taken. These advisories include:

How much is the toll?

  • The toll has not been set. But the toll should follow a rate schedule that takes into consideration peak and non-peak hours of operation with incremental adjustments to account for demand.

What are the toll hours of operation?

  • Hours of operation are not yet determined. At a minimum, the toll will need to be in place during weekday rush hours. Specific hours of operation will be determined through a subsequent study.

How is the toll level being determined?

  • TIMMA should set the toll level periodically, to raise enough revenue to provide recommended transit service levels and achieve transportation performance targets, in combination with other committed sources of operating funding. The toll level should also be indexed to address transit cost inflation.


TIMMA will conduct financial modeling to inform recommendations for a toll level structure as well as how much additional committed sources of funding should be pursued to reduce reliance on toll revenues. We will also conduct travel demand forecasts, develop a Treasure Island-focused mandatory transit pass as required by the development agreement, and develop a Transportation Affordability Program. As these planning activities proceed, TIMMA will implement an outreach plan to involve stakeholders in the process.