Any Traffic-related apps to recommend?

[phenomphantom]

Im a frequent traveller, what are some traffic related mobile applications that can help in my travelling life? other than
1) navigation & map type apps
2) transport service apps
are there any other genres?
similar apps of Uber, are there any?
similar apps of waze, google maps & route 66, can recommend me some rare ones?

 

[cpaight]

It's not a traffic app, but Field Trip is good for pointing out interesting things around you when you're in a new city.