Abstract: An absolute pitch is outputted from an inclination sensor. A gradient related quantity is outputted from a gradient related quantity detection sensor for detecting a gradient related quantity that can specify a gradient of a road surface. The absolute pitch angle and the gradient related quantity are acquired by a vehicle headlight control apparatus. Based on the absolute pitch angle and the gradient related quantity, a pitch angle of a vehicle with respect to a road surface is calculated by the vehicle headlight control apparatus. Based on the pitch angle, an optical axis direction of the head lamp is controlled by the vehicle headlight control apparatus.

Abstract: A light control system acquires presence information that indicates whether or not another vehicle is present in a lateral or rear direction relative to an own vehicle. If presence information indicates the presence of another vehicle, the illumination range of the headlights of the vehicle is changed so as to be narrower. Thus, when another vehicle enters the illumination range from a lateral direction relative to the vehicle equipped with the system, the illumination range of the lights of the vehicle is changed to a narrower range before the entry into the illumination range.

Abstract: A light control system acquires presence information that indicates whether or not another vehicle is present in a lateral or rear direction relative to an own vehicle. If presence information indicates the presence of another vehicle, the illumination range of the headlights of the vehicle is changed so as to be narrower. Thus, when another vehicle enters the illumination range from a lateral direction relative to the vehicle equipped with the system, the illumination range of the lights of the vehicle is changed to a narrower range before the entry into the illumination range.

Abstract: An absolute pitch is outputted from an inclination sensor. A gradient related quantity is outputted from a gradient related quantity detection sensor for detecting a gradient related quantity that can specify a gradient of a road surface. The absolute pitch angle and the gradient related quantity are acquired by a vehicle headlight control apparatus. Based on the absolute pitch angle and the gradient related quantity, a pitch angle of a vehicle with respect to a road surface is calculated by the vehicle headlight control apparatus. Based on the pitch angle, an optical axis direction of the head lamp is controlled by the vehicle headlight control apparatus.

Abstract: A light control device for vehicles that controls a light axis direction of a headlight in the vehicle has an inclination acquisition means that acquires a detection result of an inclination of the vehicle, and a light axis direction changing means that changes a direction of the light axis by a response modified by a predetermined filter, so that the light axis directions of the headlights approaches an angle beforehand set to align it with the road surface according to the acquired inclination of the vehicle.