It will say "Take a left on Main St." then think for a little while, and then beep because it needs to reroute you.
It's really annoying, because it means you need to look at your screen in order to figure out exactly where you are going. Google Mpas gives much, much, much better verbal instructions. I know WAZE doesn't have as much information on every given road as Google, but it isn't difficult to figure out if the next instruction is going to be given too late.