Wednesday, July 29th, 2026 at 11am PDT / 3pm EDT

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Does California’s First Speed Camera Installation in San Francisco Reduce Speeding? A Quasi-Experimental Analysis

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This project, led by researchers at UC Berkeley’s SafeTREC, evaluates the effectiveness of California's first speed camera implementation using a quasi-experimental design based on telematics data. San Francisco became the first of six cities in California to pilot speed cameras in 2025 following the passage of State Assembly Bill 645, and the performance of its program has policy implications for the potential broader rollout of speed cameras across the state. The San Francisco pilot program involved installing 56 speed cameras at 33 high-risk locations. Using a quasi-experimental design that leveraged data from SFMTA citations and INRIX data on vehicle speed and volume, the study team found that the cameras successfully reduced speeding compared to selected control locations after adjusting for fixed effects.  The preliminary findings indicate that most speed-related behavior change occurred during the initial warning period, with evidence of sustained change throughout the citation period. In addition, the cameras appear to be more effective on higher speed roads. Notably, speeding reduced at both the treatment and control sites, indicating a potential citywide impact from a limited application of automated enforcement.