Top image: Caltrain electric train at Santa Clara station. Photo: Mliu92 / CC BY-SA 3.0 via Wikimedia Commons

Of everything on the Nov. 3 ballot in Santa Clara and San Mateo counties, the measure with the biggest long-term consequences for how the region moves may be the one named, a little blandly, the Regional Transit Measure.

Voters in Alameda, Contra Costa, San Mateo and Santa Clara counties will decide whether to add a 0.5% sales tax for 14 years; San Francisco voters will consider a 1% rate. The ballot question says the tax would generate approximately $980 million a year “to prevent major service cuts to BART and other transit,” and lists Caltrain, VTA, SamTrans, AC Transit and Muni among the systems it would preserve, according to the official notice of election. It needs a simple majority across the district.

How it got here

The measure was authorized by Senate Bill 63, the Connect Bay Area Act, written by state Sens. Scott Wiener and Jesse Arreguín. It qualified as a citizens’ initiative after district elections officials certified sufficient signatures on July 1, according to the Metropolitan Transportation Commission, whose board also governs the new Public Transit Revenue Measure District that would administer the money.

An MTC fact sheet lays out annual allocations, including $310 million for BART, $155 million for Muni, $70 million for Caltrain and $50 million for AC Transit, plus local transportation improvement funds of $245 million for VTA and $45 million for SamTrans. The law also requires an independent oversight committee with at least one appointee from each county.

The South Bay is different

For Santa Clara and San Mateo voters, the measure works differently than it does in San Francisco or the East Bay. SPUR, which co-leads the Yes campaign, explained the math in a June analysis. BART’s operations in Santa Clara County are already covered by a separate VTA agreement, and county voters have approved multiple local sales taxes. As a result, about 85% of the money raised in Santa Clara County, roughly $264 million a year by SPUR’s estimate, would return to VTA for local priorities after covering the county’s share of regional programs and Caltrain’s projected deficit. VTA’s framework groups spending into “Foundation,” “Reimagine” and “Transform” tiers, from pothole repairs and bus stops to transit signal priority, new light-rail vehicles and grade separations.

In San Mateo County, SamTrans would receive about $50 million a year, or about 37% of local revenue, SPUR wrote. The rest would support Caltrain, BART and Muni, which San Mateo residents use heavily.

In other words, for South Bay voters RTM is partly a contribution to regional rail and largely a new local transit tax.

Where voters stand

The measure is not a sure thing. An Embold Research poll conducted Aug. 5-18 for Joint Venture Silicon Valley and the Bay Area News Group found 48% support, 34% opposition and 18% undecided among 1,801 adults in the five counties, Bay Tribune reported. Support was strongest among adults under 35 (69%) and renters (60%). Notably, the survey sampled adults, not likely voters.

The Yes campaign disputes the poll. Spokesman Jeff Cretan said its question omitted ballot language about traffic, safety and preventing cuts, and pointed to the campaign’s own July poll showing 54% support, rising to 58% once voters heard about potential cuts. A separate EMC Research survey of about 1,700 voters also found 54% support, CBS News Bay Area reported.

Supporters warn of severe consequences if it fails. Emily Loper of the Bay Area Council, a co-sponsor, told CBS that BART could cut service by up to 70% and close up to 15 stations, and that Caltrain could drop to hourly service. Opponents include anti-tax groups, ConnectedSF, an advocacy group backed by Y Combinator CEO Garry Tan, and the editorial board of The Mercury News and East Bay Times, which cited BART’s failure to adjust to post-pandemic ridership and weak oversight provisions, according to Bay Tribune. Gregg Dieguez of the Committee for Affordable Bay Area Transit called it “a regressive tax that would hit the lowest-income people who could least afford it the most.” His group’s lawsuit over the ballot wording was dismissed.

The long view

The deeper question is whether the Bay Area runs one transit system or two dozen. RTM would add a new regional funding layer and an MTC-run district with oversight duties, a modest step toward integration. For Silicon Valley, Caltrain’s fate matters most: it is the Peninsula’s spine and the corridor that ties the region’s tech campuses together. A no vote would not end transit here, but it would force the South Bay to decide, alone and quickly, how much of the regional network it is willing to pay to keep.

Sources: Public Transit Revenue Measure District notice of election; MTC; MTC SB 63 fact sheet; SPUR (June 18, 2026); Bay Tribune (Oct. 10, 2026); CBS News Bay Area (Sept. 10, 2026). SPUR is a co-leader of the Yes campaign; the Bay Area Council is a co-sponsor of SB 63.