Driving Control Method and Driving Control Device

A driving control device executes driving assistance control for a subject vehicle using a processor having a first controller and a second controller. The first controller executes lane keeping control while the second controller executes deviation preventing control. The processor determines whether or not the second controller starts the deviation preventing control during execution of the lane keeping control with the first controller. Upon a determination that the second controller starts the deviation preventing control during execution of the lane keeping control, the processor concludes the lane keeping control under execution, starts deceleration control for the subject vehicle, continues the deviation preventing control until the subject vehicle stops, and concludes the deviation preventing control under execution when the subject vehicle stops by the deceleration control.