Should have searched Github before posting: https://github.com/opentraffic/otv2-platform. And in fact I remember talking with @triangulator.org about this around the time. But the last commit was like, eight years ago... Mapzen was involved; anyone know if their routing engine uses this in some form under the hood?
So the challenge with traffic data isn’t implementation, its finding probe data. Google and Apple can do this because between the two of them, they own the location stacks on every phone. Also fwiw, the implementation has evolved dramatically since then, eg:
The big challenge with building a consumer map tho is POI data. What sets Google maps (and increasingly Apple Maps) apart is that it’s the modern equivalent of the yellow pages. That’s super hard to do locally, let alone globally. Overture maps foundation is trying to build an alternative but🤷🏻♂️
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