I have used Traffic cameras (All in one) from this link. I tried this with both .gpx and .csv files (there is about 3500 items) - the result is the same
POI importing with POI Loader has finished well - Poi loader showed that 3500 POIs was downloaded sucessfully.
Just I'm not sure, if all POI's of safety camera are realy in my device.
If I choose WHERE TO --> Categorie - user POIs -- then I see these POI's under Safety-DE, but the number of them is only about 70 instead of 3500.