[Balding_Eagle]

How accurate is WAZE with traffic slowdowns etc., I’m interested only in finding out accuracy in predicting which route is the fastest.

[kingu]

Waze depends upon user reporting to give the most accurate traffic information. Unfortunately, most of the automated reporting (WAZE reporting on traffic speeds while you're driving) has been disabled since Google bought them (didn't meet with Google’s TOS), though they are trying to bring it back with an opt-in option.

Overall, it is the most accurate predictor of speed to destination I've ever used. Google Navigate uses freeway sensors to calculate drive time, and it is acceptable, but Waze beats them hands down (hence why Google bought them for a billion dollars - pretty cool for an Israeli company.)

[piytar]

One word answer: VERY.

[Dubh_Ghlase]

Not sure of the algorithm (other WAZERs?), but I've found it to be pretty accurate. I can see the routes with congestion in red, especially if it's on my route. The app has a lot of settings for how to plan a route (avoid tolls, etc) so there may be more for alerting one to problems ahead. Note that the voice alert will announce upcoming turns (with street names and other directions), as well as hazards ahead...

You do have to anticipate, as you might come up on a turn faster than the app can alert you (GPS delay). Otherwise I like it..