A method and a system for determining an information transfer rate between a driver and a vehicle, including measuring driver information and measuring vehicle information. Further, calculating a forward information transfer rate from the driver to the vehicle using the driver information and the vehicle information over a period of time, and calculating a reverse information transfer rate from the vehicle to the driver using the driver information and the vehicle information over the period of time. Additionally the method includes, calculating a driver control state using the forward information transfer rate and the reverse information transfer rate.