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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.
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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?