Google just made an announcement that new alers will be added into Google Maps to assist drivers to avoid traffic jams. These alerts are already been around on Waze all these while by the way.
Now when you input your destination, you’ll get an explanation of upcoming traffic conditions that helps you identify the quickest route. While you’re on the road, Google Maps will give you a heads up if congestion lies ahead, and how long you’ll be stuck in a jam. You’ll also get the option to take alternate routes, including explanations for why one is recommended—whether it’s the fastest or avoids an incident.
There’s no information on these new alerts will be a background update or if it requires an app update from the store. Anyway, Im sure it will come soon. You can get Google Maps from the App Store for free.