This is an interesting question. When you input a destination and are presented with the 3-route option, the choices are Quick, Short, and Alt. I think that the Quick route takes traffic into account. But the Nav system will not dynamically change the route when new traffic incidents crop up. It will, however, notify you when new traffic incidents occur on your route, but I think the broadcast traffic info that the system receives is only updated every 15 minutes. It’s not crowdsourced and constantly updated like the Wayz™ app.
I suppose if you were being guided on a route and received the Accident Ahead notification, you could cancel the navigation, and then re-enter the destination from the Recent Destination screen, have it recalculate, and then you would choose the quickest route and perhaps avoid the recent traffic incident. This of course depends on weather the nav system takes the traffic info into account when it calculates the routes.