How do you normalize GPS data?

For U.S. Projects, the value is normalized by adjusting the number of trips in our data sample to the actual number of trips in a region around Sacramento CA, as derived from the measurements published by the California Department of Transportation. This allows us to capture monthly and seasonal variation more accurately, even as our sample grows.

For Canadian Projects, a value of 500,000 on each index corresponds to average daily traffic on a highway near Toronto.

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