These alerts will be provided as you drive, which will be updated as and when Google is able to do so. Suggested route alternatives will be supplied when creating a journey too. An interesting feature of the upcoming update is Google Maps will be able to estimate how long you may be stuck in said traffic should you ignore alerts and continue on your affected journey.
It'll be a welcomed update and one that will surely help you remain on the move and avoid hold-ups. As noted already, this update will hit Google Maps in the coming days.
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