What's happening: Marin County ranks first among California's 58 counties for bicyclist crashes involving victims under 15, according to an analysis Jen Shriber of Parametrix presented to the Transportation Authority of Marin's board on June 25, based on state Office of Traffic Safety data.
The county recorded 28 young cyclists killed or injured in 2023, the most recent year OTS has published. Marin ranked 14th of 58 for pedestrian crashes in the same age group, with 9 victims.
Why it matters: The ranking is part of TAM's School Access Safety Action Plan, a countywide review presented to the board that examined a decade of crash data near schools. According to the presentation, the analysis narrowed 17,270 crashes across Marin down to 386 involving young cyclists or pedestrians, and identified 24 priority locations for safety fixes across the county's towns and unincorporated areas.
The context: The June 25 ranking is a countywide figure. The presentation did not break out how many of Marin's crashes occurred in any single town, including Mill Valley. A separate TAM presentation on the same safety plan, delivered in April 2026, identified Miller Avenue, East Blithedale, and Sycamore Avenue near Mill Valley Middle School as local crash concentrations, with unsafe speed and improper turning cited as leading causes.
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