It was pretty neat for me today. When I woke up my phone told me it would take approximately 18 minutes to get to work given current traffic conditions. As the work day was ending I got a card saying about the same amount of time getting back - though by the time I left the timer had increased to about 30 minutes.

I like this a lot, if there is an accident or something I'll notice via this card and potentially avoid it. Great potential here.