There is provided a method for alertness control of a vehicle operator, the method comprising: obtaining, by an apparatus, physiological status data of a person acquired using at least one sensor comprising at least a biosignal sensor determining, based on at least the physiological status data, at least one alertness value being indicative of alertness level of the person determining, by comparing the at least one alertness value to at least one alertness reference value, whether the alertness level of the person is below a threshold alertness level for operating the vehicle and as a response to the determining that the alertness level is below the threshold alertness level, causing an output of a control signal.
