Patent ID: 8068968

Claim:
A vehicle control system comprising: means for automatically driving a subject vehicle at a fixed speed without a driver's cruise operation for adjusting a cruise speed of the subject vehicle; means for detecting a driver's actual concentration degree based on a state of the driver; means for acquiring a required concentration degree required to the driver for safely cruising the subject vehicle based on information related to surrounding environments of the subject vehicle; and means for changing a control content of the driving means based on a relation between the actual concentration degree detected by the detecting means and the required concentration degree acquired by the acquiring means, wherein the required concentration degree acquired by the acquiring means becomes small as the cruise speed of the subject vehicle becomes low, and wherein, when the required concentration degree is larger than the actual concentration, the changing means changes the control content of the driving means to decrease a speed, at which the driving means drives the subject vehicle, until the required concentration degree becomes smaller than the actual concentration degree by a specific value.