Re: Apple Maps
It appears that TomTom is the primary source of traffic data for Apple Maps. You'd have to check with TomTom to see their sources, but some of it is user-sourced. You can get the complete list of third party data sources for Apple Maps by tapping the circles I in the bottom right corner.
Originally Posted by muchospanish
Some traffice data sources are crowd-sourced (Waze, forex), and others use reporting data from highway and police departments or dedicated traffice sources.