Deactivate Fleeting Button
Fleeting a signal allows it to automatically set a route when a train approaches. Deactivating fleeting disables this mechanism.
Disabling fleeting on a fleetable signal is done using the Deactivate Fleet Button (SBRT), together with the button of the signal. When fleeting is enabled, the "D" light beyond the signal is lit. When fleeting is disabled, the "0" light is lit.
Enabling a fleetable signal is done using the Activate Fleeting Button, together with the button of the signal.