Red Light Cameras in San Mateo: A History and the Future
San Mateo ran an automated red light camera program for about 14 years. It launched in 2005 and the City Council voted to end it in July 2019 after a yellow-light timing error triggered nearly 1,000 refunds and a program review claimed the safety benefit had flattened out. The program formally shut down on October 20, 2019.
This topic often comes up online so I wanted to gather both the history I could find and what a path forward for automated enforcement could look like. The specific legal challenges that made the old program hard to run were addressed by the new state laws in 2025. San Mateo could bring red light cameras back under a workable framework if it chose to, and the city's stated reason for ending the program looks weaker than it did in 2019.
How the program was built
The cameras went in across 2005 and 2006, eventually covering three intersections: Saratoga Dr & Hillsdale Blvd, Hillsdale Blvd & Norfolk St, 4th Ave & Humboldt St. The stated goal was to reduce red-light collisions and violations.
What went wrong
The program's recurring weakness was yellow-light timing. A yellow that runs even a fraction of a second short can produce invalid citations, and San Mateo's yellows fell short of the minimum more than once.
In January 2009 the Palo Alto Daily Post used frame-by-frame video to show the yellow at Saratoga Dr & Hillsdale Blvd was shorter than federal guidance. The Police and Public Works departments denied it and called the paper irresponsible.
In October 2015, after new statewide yellow-timing rules had taken effect, NBC Bay Area timed the lights at the Saratoga Dr & Hillsdale Blvd and Hillsdale Blvd & Norfolk St intersections and again found the yellow too short. This time the city dismissed roughly 950 tickets and reset the timing.
Then it happened a third time, and this one ended the program. During a construction project between December 2018 and May 2019, the yellow on southbound Saratoga Dr & Hillsdale Blvd was inadvertently set to 3.4 seconds, two-tenths of a second under the 3.6 second state minimum. The city issued 985 citations at that approach during the window. When the error surfaced in May 2019, the city corrected the timing and suspended all automated enforcement citywide.
Why the city ended the program in 2019
The city issued a press release in July of 2019 announcing it would cease the program and refund or dismiss the 985 affected citations. The city's official reasons were:
- The trigger event. The yellow-timing error at Saratoga and Hillsdale and the 985 citations it required the city to refund.
- A plateaued safety benefit. The city's evaluation found no significant change over time in total collisions, red-light collisions, or collisions at the three camera intersections. City Manager Drew Corbett said the cameras were no longer improving driver behavior the way they once had.
- Heavy to administer. The city called the program resource-intensive and complex.
- State law made tickets hard to issue. The old statute forced cities to identify the driver and mail the citation within 15 days, and when a driver was hard to identify the city often ran out of time.
That last point is an important one. In 2018 the camera intersections recorded 18,133 violations, but the city issued citations for only about 23 percent of them, largely because of the 15-day driver-identification rule. The program was catching far more red-light running than it could actually act on.
The case for automated enforcement
Despite what the city claimed, there is broad evidence that red light cameras save lives. The Insurance Institute for Highway Safety found that cameras reduced the fatal red light running crash rate and the rate of all fatal crashes at signalized intersections. More importantly, in cities that switched red light cameras off, the fatal red light running crash rate went up by about 30 percent.
The question shouldn't be whether automated enforcement can work, but how a program can be designed to be fair and effective. The ~$500 criminal fine fell heavily on lower-income drivers, and the revenue was not tied to fixing the road design, which left every program open to the charge that it was more about money than safety. Critics like Techdirt and TheNewspaper.com leveled exactly that charge at San Mateo, noting that in its last full year the city netted ~$266,000 from the cameras while Redflex collected ~$239,000 in fees. The city spent more time and effort defending its yellow-light timing than redesigning the intersections and roads where people kept running the light.
What changed: new state laws
The old program ran under a 1995 state law built around a criminal fine and a photo of the driver's face. The Safer Streets Act of 2025, rebuilds that model. Governor Newsom signed it on October 13, 2025, and it took effect January 1, 2026. It rewrites automated red light enforcement around the registered vehicle owner and a low civil penalty instead of the old criminal framework.
| Provision | Detail |
|---|---|
| Scope | Statewide opt-in. Any city or county can adopt a program by passing an impact report, with no separate legislation per jurisdiction. |
| Liability | Citation goes to the registered owner based on the rear plate, like a toll or parking ticket. No driver identification required. |
| Penalty | Civil, not criminal. No DMV point, no license suspension, no insurance impact. |
| Fine | $100 for a first violation, escalating up to $500 for repeats within three years. |
| Privacy | Rear plate only. Facial recognition prohibited. Records confidential and not shared with law enforcement absent a court order. |
| Equity | Lower-income drivers can get an 80 percent fine reduction. Placement of cameras must be geographically and socioeconomically diverse. |
| Revenue | Must first cover program cost. The rest is restricted to local traffic safety projects. |
| Warning period | 60-day warning phase for any camera installed after January 1, 2026. |
The biggest changes are the civil rather than criminal penalty and using the revenue generated to support safer infrastructure like crosswalks and traffic calming. Guiding funds towards safety projects removes the incentive to leave dangerous roads in place, and it pairs naturally with the engineering fixes that do the real work.
What this means for San Mateo
Red light cameras are available again, under a framework that works. San Mateo could re-establish a program under SB 720 without the legal problems that ended the old one, and the new rules make it far simpler to administer. The yellow-light timing still has to be addressed by the city. Any new effort should set yellow intervals with margin above the state minimum, audit them regularly, and recheck them after any construction that touches a signal.
Speed cameras are an option if the city chooses. AB 645, the 2023 speed camera pilot, is limited to specific cities. San Mateo can't opt in under the current law, but there is precedent for cities getting added to the pilot, and the city could lobby to be added.
There is regional evidence that a well-built automated speed enforcement program works. After SFMTA's speed cameras reached full enforcement in August 2025, the agency reported roughly a 72 percent drop in speeding at 15 key camera sites in the first six months. San Francisco's program is built on the modern model, low civil fines and revenue dedicated to safety, and it is changing behavior.
Shutting the cameras off may well have cost San Mateo safety rather than saved it. If the city is serious about Vision Zero and the people killed on its streets, automated red light and speed enforcement deserve a serious look. Both should be considered as one piece of a holistic safe-streets program rather than a revenue line item.