I use my phone constantly for directions, as I’m sure millions of drivers do. And one of the primary situation I and others run into is that the chosen route turns out to be a bad one due to traffic, road closures, or accidents.
Apple Maps in iOS only lets you pick among possible routes when starting, although it will warn you and re-route while you’re underway. Google Maps for iOS has an in-progress re-routing option that isn’t as obvious, based on reader email.
While you’re actively following a route, tap the icon at the bottom of Google Maps that looks like a fork in the road with the left path dotted and one right path in black. It brings up an overview of the map …
Read more here: Macworld How-To