I find Waze quite good for traffic conditions. The only thing it always tries to steer me wrong with is that there's 2 main routes home from work, around the North East of the city, and on the bypass around the West/South of the city. It always wants to take me on the bypass as when I'm at the exit for the other route, traffic is way lighter. However by the time I'm halfway home on the bypass traffic has brought itself to an essential standstill. And there's no real ways cutting across the city that avoids the high traffic section of the bypass that doesn't take longer than sitting in traffic. Also...the NE route is at most 15mins longer due to speed limits, but it's 20ish km shorter.