TRAVELING CONTROL METHOD AND TRAVELING CONTROL DEVICE FOR VEHICLE

A system trigger mode and a driver trigger mode are provided. In the system trigger mode, when a start condition for an automated lane change function of performing a lane change of a vehicle by autonomous travel control is satisfied, lane change information as to whether or not to accept execution of the automated lane change function is presented; when an acceptance input of accepting the execution of the automated lane change function is detected in response to presentation of the lane change information, a determination is made as to whether or not the lane change is possible; and when a determination is made that the lane change is possible, the automated lane change function is executed. In the driver trigger mode, when a predetermined lane change instruction operation is performed, a determination is made as to whether or not the lane change is possible, and when a determination is made that the lane change is possible, the automated lane change function is executed. The time for determining whether or not the lane change is possible by the driver trigger mode is set shorter than the time for determining whether or not the lane change is possible by the system trigger mode.