Google Now notified me that it had determined where I live, where I work and where I make regular visits, and asked me to confirm that it had the locations corr

Google Now notified me that it had determined where I live, where I work and where I make regular visits, and asked me to confirm that it had the locations correctly (it did). Now it tells me when I need to leave to get to an appointment, depending on how I'm getting there and what the traffic is like. I didn't have to set up or configure any of it - it just worked.