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Bridge traffic is also useful[1]. I wish they would break out the Dumbarton Traffic since that is an amplified value due to the fact that once the Valley is fully occupied, additional employees must come from somewhere else.

[1] http://bata.mtc.ca.gov/tolls/historic.htm

If you want to spend the time to dig into it, Caltrans has a more detailed dataset of historical traffic [1]. I used to research traffic in the Bay Area, and it was fascinating to see the way in which it responded to different events.

[1] http://pems.dot.ca.gov/

I'd argue Hwy 85 is a good indicator, but it's actually been pretty horrible since about 6 months after it opened in the 90s.

> It is definitely a lagging indicator.

Almost as if a competent city planner could see the congestion coming in advance and make changes to prevent it!