[subins2000]

> It just didn't have enough movement data where you tried it

That maybe the reason, main roads have it, side-roads not so much. GMaps now have offline destination finder, I guess it doesn't even consider the movement data. The dependence on internet service for better route calculation is a bummer for travelling here.

[BlueTemplar]

That's a shame, there's nothing that prevents (the long-term, average) traffic data to be downloaded, just like map data is.