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How do popular routing gps/phones/mapping web sites update their route information?
And do any phones send back data based on the users actual trip to allow the system to update route information?
What do you mean with “route information”? The map data they use to calculate routes is usually provided by companies Like NavTeq. They provide updates to the data on a regular base.
Concerning data collected by users, TomTom provides so called “IQ routes” which are based on actual traffic data. Meaning when you travel at 5am the system will likely suggest a different route compared to travelling during rush hour.
The required data was collected by the TomTom systems but AFAIK users have to manually upload it to TomTom or at least agree to provide the data when they do an online update of their system.