When diabetics undergo a hyperglycemic or hypoglycemic event, their cognitive-motor function can be severely impaired. This has contributed to a positive correlation between diabetes and traffic incidences. Disclosed herein are devices and methods for controlling a motor vehicle in response to a blood glucose concentration of an operator. In one embodiment, a motorized vehicle control apparatus contains a processer that determines if a received blood glucose concentration is within a predetermined range and a transmitter transmits a signal to immobilize a motor vehicle without disabling ignition in response to determining if a received blood glucose concentration is within a predetermined range.