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Lafayette commission asks staff for Streetlight pilot, to pair trend data with police crash records
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Summary
The Transportation and Circulation Commission reviewed Streetlight mobility‑data capabilities, heard staff warn it is best for trend analysis not enforcement, noted a multi‑jurisdictional license and lag in data, and asked staff to return with pilot examples and to coordinate with the police department on crash/citation data.
The Lafayette Transportation and Circulation Commission on April 20 heard a staff briefing on the Streetlight mobility‑data platform and directed staff to return with example analyses and a possible pilot dashboard to answer local questions about volumes, speeds and origin–destination patterns.
Why it matters: commissioners said trend‑level traffic information could help prioritize corridor work, school‑zone safety and grant applications, but they cautioned the tool’s limits and asked staff to combine Streetlight trends with police crash and citation records to identify operational hotspots.
Patrick Gollier, transportation and circulation commission program manager, told the panel Streetlight “is best used as a trend analysis and policy support tool. It’s not to be used as, like, precise engineering or an enforcement tool.” He said staff already use the platform for quick, high‑level checks — for example, to look at routing to Stanley Middle School or daily traffic and turning movements on a segment — but that the product delivers raw data that requires staff analysis to yield answers.
Gollier described the license arrangement as a countywide seat license largely paid for by the Contra Costa Transportation Authority; Lafayette’s local share is roughly $10,000 a year. He also warned the data are not real‑time: “It takes about a half hour” to run a query but some metrics may be months behind — staff described roughly a quarter‑lag for certain datasets — which reinforces the platform’s role for trend work, not immediate traffic operations.
Commissioners pressed on limitations. Several members noted Streetlight does not provide crash or citation records; Chair Bart Carr asked staff to query the police department about quarterly sharing of citations and accident counts so those operational data can be paired with Streetlight trends to identify safety hotspots.
On next steps, the commission requested that staff bring concrete examples to a future meeting — e.g., origin analysis to downtown, volume/speed comparisons on Mount Diablo or Moraga Road, and school pick‑up/drop‑off summaries — and to propose a small, repeatable set of pilot metrics or a draft dashboard the commission could review.
The commission closed the item after confirming no public comments were received for the presentation.
