Travel control system for vehicle

摘要

A travel control system for a subject vehicle includes a radar device for detecting preceding vehicles with respect to the subject vehicle. A controlling device operates for detecting, among the detected preceding vehicles, an interested preceding vehicle which immediately precedes the subject vehicle, and for accelerating and decelerating the subject vehicle in response to a condition of the interested preceding vehicle. A relative speed calculating device operates for calculating a relative speed between the subject vehicle and a next-lane preceding vehicle among the detected preceding vehicles. The next-lane preceding vehicle is a preceding vehicle in a lane next to a lane where the subject vehicle exists. The controlling device also operates for executing one of (1) suppression of acceleration of the subject vehicle and (2) deceleration control of the subject vehicle when the relative speed calculated by the relative speed calculating device is smaller than a prescribed negative value.