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Indicates a request for relevant open data sources. Please read https://opendata.meta.stackexchange.com/q/284/17438 for writing a good request.

6 votes
5 answers
954 views

How to acquire data about the speed and density of vehicle on freeways?

I'd like to find out the relation between the speed and density of traffic flow, and now I need some real data, but I don't know how to find it. Could you please tell me?
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