The Google Now feature is essentially an alarm specifically tailored to public transportation that recognises set locations and updates users ahead of their transit stop. So now if you doze off in a metro on your way back home from office, or are unsure of the bus routes, the set alarm will alert you before you get to the stop nearest your saved destination.
Similar to the alarm function, the feature is separate from the standard clock, and automatically alerts users boarding public transportation of the correct public transit stop for them.
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