Final answer:
A steady AP Disengage message means the Autopilot system has been disengaged by the driver, while a flashing AP Disengage message indicates a temporary unavailability or error. The driver must take over in both cases.
Step-by-step explanation:
A steady AP Disengage message indicates that the Autopilot system in a Tesla vehicle has been disengaged by the driver and is no longer controlling the vehicle's movements. This could happen when the driver takes manual control of the vehicle or when an event occurs that requires the driver to take over. On the other hand, a flashing AP Disengage message indicates that the Autopilot system is temporarily unavailable or has encountered an error. In this case, the driver must take immediate control of the vehicle.
For example, if a Tesla vehicle encounters a situation where its sensors cannot accurately determine the road conditions or if the Autopilot software detects a problem with its functionality, it may display a flashing AP Disengage message to alert the driver that they need to take over driving.