What's interesting is that this traffic map is also loaded on Mazda cars, but shown in a different application. Somehow the system searches for a HDRadio signal

What's interesting is that this traffic map is also loaded on Mazda cars, but shown in a different application. Somehow the system searches for a HDRadio signal in the background to update this map from an independent receiver. I've had AM radio on for long periods and then load this app, and the traffic map is up to date. I've also driven to a different city and the map is now showing the new city.