Driving Control Method and Driving Control Device

A processor of a driving control device compares a vehicle speed of a subject vehicle traveling in a first lane with a vehicle speed of an adjacent other vehicle traveling in a second lane to determine whether a relative speed of the adjacent other vehicle to the subject vehicle is equal to or less than a predetermined speed difference threshold, and relaxes a travel condition for permitting the subject vehicle to travel at a predetermined driving assistance level when the relative speed is equal to or less than the speed difference threshold.