If you have reliable internet connection via cell service, it's best to keep the distance of collecting TMC to small as possible (if you collect 50km worth of data, by the time you get to it the problem could be over) TMC can be from users reporting and they could be *cough* wrong.

HSP is attempt to use data from user history of driving in order to get more accurate routing. For example, if a street normal speed is 45 but it's under construction so effectively it's only 20 (because that's the speed that it compute when you drove), then routing would know to give more accurate time it will take if that street is choosen.

HNR uses routes that are more "effective" from major cities; for local routing, I don't think it matter much. But for routing across states/countries it could help. For HNR to work correctly you must have all the relevant states and countries map data and .hnr files.