If a vehicle in your fleet moves and no driver has signed in and selected the vehicle, you can configure an alert to notify you when a vehicle is creating unassigned driving. This alert will only trigger if a driver has not signed in via the Samsara Driver App. Other driver to vehicle assignment methods (Driver ID tokens, etc.) will not work with this alert.
To configure an Unassigned Driving alert, navigate to Alerts > Configure > Unassigned Driving.
To learn more about alert basics please visit: here.