When you live and drive in NYC, or in SoCal, the traffic data is the most important thing in the car! The only problem is when ALL of the alternates are red! We don't go anywhere without checking traffic on-screen. Yes, you can get it on your phone or through a phone app onto the screen, but this is just so convenient. And even if the navigation includes traffic anyway it doesn't matter to me. I never use navigation to get around the city. That said, the navigation told us to go into Manhattan to get to Brooklyn from the Bronx, and it turns out there was no traffic that way while Queens was a total mess everywhere. You generally avoid Manhattan at all costs. It did add a toll though.