1. An adaptive cruise control system for an automotive vehicle, comprising: a trajectory determination section to collect trajectory information used to determine a future trajectory of the vehicle; a driving state determination section to collect vehicle information used to determine a driving state of the vehicle; an output section to change an operating condition of the vehicle; and a control unit in operative communication with the trajectory determination section, the driving state determination section, and the output section, the control unit being configured to perform the following: determining the vehicle future trajectory; determining the vehicle driving state; estimating in accordance with the vehicle future trajectory and the vehicle driving state a future driver load imposed on a driver of the vehicle during the vehicle traveling through a target section of the vehicle future trajectory; and changing the vehicle operating condition in accordance with the estimated future driver load, so that the future driver load decreases.