A variable lamp system for a vehicle includes one or more sensors to detect an object at a side or a rear of the vehicle, and acquire driving information of the object, a lighting device including one or more lamps, and a controller to control the lighting device and brightness of the one or more lamps of the lighting device based on the driving information.

A vehicle lighting device disclosed in this specification comprises an illumination unit that draws an image on a road surface around a vehicle by illuminating the road surface with light; a turn signal unit that causes a turn signal lamp to flash; and a controller configured to control the illumination unit, wherein when the vehicle changes a lane from a first lane to a second lane adjacent to the first lane, the controller causes the turn signal lamp to flash on a lane change side, and causes the illumination unit to draw a lane change image for notifying surroundings of a behavior of the vehicle, and the controller changes a configuration of the lane change image according to at least one of a presence and a position of a subsequent vehicle traveling rearward of the vehicle and along the second lane.