It took 3 weeks, but I finally have my first traffic notification.
Not sure why it took so long.
I wonder if it has something to do with how many other iPhone users in your area also use this feature?
More users would mean more data.
Or, are my routes and travel times logged and then averaged?
I'm guessing the former, or it wouldn't have taken this long to finally get one.
Also, I live in Canada, and iPhone market share here is lower than in USA, which would mean less aggregate data to work with, therefore more time required to give a travel estimate.
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Now for those who've been getting them for a week or two:
How accurate are the drive times?