VEHICLE SYSTEM, CONTROL METHOD, AND STORAGE MEDIUM

A vehicle system restricts causing a host vehicle to perform lane change to a third lane adjacent to a second lane and a first lane and opposite to the second lane without depending on an operation of a driver, when determining that the host vehicle travels in the first lane and the second lane adjacent to the first disappears at a first distance ahead from a position of the host vehicle, and permits causing the host vehicle to perform the lane change to the third lane without depending on an operation of a driver, when the host vehicle reaches a second distance set between the first distance and a position at which the second lane disappears.