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You can and you should contribute - Open Street Map
(lemmy.blahaj.zone)
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No, unfortunately not. Getting traffic data would mean users volunteering to share location data, would need a centralized system to process everything, and would need a critical mass of users sharing said data to be anywhere near useful. The other possibility would be to pay for data from a provider like Google under an enterprise license that doesn't require sharing data back, but I don't know if that is even an option.
For now, I use both on my phone. I use OSM when biking or walking, I use Google Maps when driving, and I use my local transit web app when taking transit. I plan to switch my Pixel phone to GrapheneOS and to sandbox Google services that I still need. That being said, the ultimate way around needing traffic information is to try to live in places and in such a way that driving is not very necessary, but I know that is a huge ask for a lot of people.
EDIT: To be clear, MagicEarth does have live traffic as @Schlemmy@lemmy.ml pointed out and is based on OSM, but is not itself open source.
time for some kind of anonymizing location data sharing service, peer to peer or federated protocol? that might be interesting, or sketchy, not sure which.
There is OpenTraffic but it seems unfinished and not implemented anywhere as far as i can tell. Edit: just to clarify, ive only heard from others that it's unfinished, havent checked myself :)
That's a super interesting project. For anyone else, the project overview has some great system level diagrams:
https://github.com/opentraffic/otv2-platform
It looks really interesting - but unfortunately it seems it's abandoned? Last time it was updated was 7 years ago...