Not really. Waze gives me notice of a changed route to avoid traffic as soon as waze calculates that the alternate route is significantly better. Unfortunately, that calculation and, thus, warning sometimes occur right when you are at the turn off of the current route and, thus, you don't have time to change lanes or make the turn.
Regional Coordinator: Mid-Atlantic, US
Verizon, Nexus 6, Android 6.0.1, Waze 18.104.22.168