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Caltrans and CTC propose one-week counts, CAD portal and validation standards for ATP projects
Summary
Caltrans consultant and CTC staff proposed updated ATP count guidance calling for 1–3 locations per project, a one-week continuous counting period, manual counts from video as preferred method, validated automated alternatives and an active-transportation data portal to host counts and compute annual estimates.
At a Dec. 10 CTC workshop, Julia Griswold (presented as affiliated with the University of California, Berkeley) and Caltrans/CTC staff outlined proposed updates to ATP count methodology and introduced the California Active Transportation Data (CAD) Portal as a clearinghouse for project counts.
Griswold said the portal and guidance aim to improve the accuracy and consistency of performance metrics. “We are asking for 1 week, or 7 continuous days at each location,” she said, describing the one-week baseline as a way to avoid complex expansion-factor math and to produce more accurate annual average daily traffic (AADT) estimates for pedestrians and bicyclists.
Key elements of the proposal - Count locations and frequency: Infrastructure…
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