You will need a data connection to get updated speedcams and traffic.
See link:
Spoiler: link
- Lifetime TomTom Traffic: Always drive with real-time traffic information for the lifetime of your app*
- Lifetime Safety Cameras: Avoid speeding fines with accurate and timely speed warnings for the lifetime of your app*
* Checkfor availability per country. Services require a cell phone connection.Spoiler: link
I think most if not all GPS app will go this way with online speedcams.
The cost of roaming will change this year and in 2017 across the EU the roaming cost will be the same as in you home country.
As it stands already the cost for getting speedcam and traffic updates with a data connection is not at all costly anyway to begin with.
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