TRAVEL CONTROL APPARATUS

A travel control apparatus includes: a detection unit configured to detect an exterior environment situation around a subject vehicle; and a microprocessor configured to perform: recognizing, based on a detected value of the detection unit, a traveling state of a preceding vehicle on a current lane; determining, based on a recognized result, whether the preceding vehicle has started a deceleration; estimating a traveling trajectory of the preceding vehicle through a Kalman filter to which a physical quantity representing the traveling state of the preceding vehicle is to be inputted as an input value; and controlling a traveling actuator based on an estimated result to make the subject vehicle follow the preceding vehicle. The estimating includes, when it is determined that the preceding vehicle has started the deceleration, varying a weight for the Kalman filter.