The GoCarma app activates automatically when you travel in a qualifying HOV / Express Lane.
For example, in Dallas-Fort Worth, while you travel in a TEXpress Lane corridor, GoCarma collects the following data.
Time data: the time at which you traveled in a TEXpress Lane
GPS data: your location as you travel through in the TEXpress Lane
Bluetooth data: the proximity of GoCarma user devices (smartphones, GoCarma Passes, Occupant passes)
This data is kept for 60 days and is used only for the purposes of verifying your HOV status.