And neither are radar detectors. Waze has been more accurate than any radar detector I've ever used and it will tell you about problems hundreds of miles away if you want, rather than only a few hundred feet. Radar detectors also won't give you traffic reports.
Then again, I'm not one of those types that always drives 5 or 10 over.

I'm more interested in traffic conditions than police, since I'm not constantly breaking the law.