Control device for vehicle, control method for vehicle, and nontransitory computer storage medium

A control device for a vehicle is configured to detect road markings on a road based on outside environment data relating to an environment around the vehicle, perform driver's assistance for warning of or avoiding departure of the vehicle from a running lane based on results of detection of road markings, and, if the road markings include markings indicating a neutral zone in which running of the vehicle is not recommended, change the conditions for actuation of driver's assistance so that driver's assistance with respect to entry into the neutral zone is suppressed.