1. An apparatus, configured to be attached to a wrist of a person in a vehicle system, comprising at least one processor and at least one memory including a computer program code that, when executed by the at least one processor and when it is determined that the person has initiated driving a vehicle, causes the apparatus to at least: obtain, using at least one sensor comprising at least a bio-signal sensor, physiological status data of the person driving the vehicle, wherein the at least one sensor comprises a heart activity sensor, and wherein the physiological status data comprises cardiac activity data of the person, wherein the cardiac activity data comprises cardiac activity history data of the person; determine, based on the cardiac activity history data, a cardiac activity of the person related to a first threshold alertness level for driving the vehicle; determine, based on real-time cardiac activity data, current cardiac activity of the person being indicative of a current alertness level of the person; determine, by comparing the current cardiac activity of the person to the cardiac activity of the person related to the first threshold alertness level, whether the current alertness level of the person is below the first threshold alertness level for driving the vehicle; and cause a wireless output of a control signal as a response to the determination that the current alertness level is below the first threshold alertness level, wherein the control signal is at least for the vehicle system to take control of driving operation of the vehicle.