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How does an offline app get traffic data
It could download time based averages alongside the map date, not perfect but decent most of the time.
Really though this is an OSM wrapper so it would likely need to be integrated there
To be honest, even a static DB of recorded road speed using time of day, day of week, time of year, averages, would be a lot better than nothing. It would mean it knows you can’t really go 60 down a bendy, narrow, stone wall lined, single lane, country road. Not and live anyway. So it would stop trying to use them all the time.
But hey, if there is internet, why not query it for the latest?
I don’t think you should be using satnav to determine if you can power around a blind bend. That’s a quick way to the grave