Method and apparatus for monitoring a vehicle. An apparatus comprises a sensor system and a computer system. The sensor system is associated with a number of human operators of a vehicle and a number of components in the vehicle. The sensor system is configured to generate physiological data for the number of human operators. The computer system is configured to receive the physiological data; determine whether the physiological data is within a level for a desired level of performance for operating the vehicle based on a policy; and perform a number of actions to maintain the desired level of performance for operating the vehicle in response to the physiological data not being within the level for the desired level of performance.