The built-in apps on the car don't always give you updates on traffic, and they most certainly don't give you updates on the locations of police.
There are long threads in vehicle forums, dedicated to hacking the OS of the console, so people can add their *own* apps and navigation systems.
Also, there's something very creepy about driving along, and hearing "Caution! Toll booth ahead!" coming out of your speakers, when you aren't using navigation at all.
Which is just one of the many reasons why forum modders work so hard to dump the stock OS.