The installation of obstacle marker lights for obstacles should indicate the highest point and edge (i.e. visual height and width) of the obstacle, and aviation obstacle lights should be installed. The spacing between the middle floors must not be greater than 45 meters. In urban buildings with a height of over 100 meters, it is particularly important to consider adding aviation obstacle lights in the middle floor. The vertical and horizontal distance of aviation obstruction lights should not be greater than 45 meters (that is, if the top of the object is higher than its ground by more than 45 meters, obstruction signs must be added in the middle)

Aviation obstacle lights are generally divided into three types: low intensity, medium intensity, and high intensity. The vertical and horizontal distances of aviation obstacle lights for buildings and their facilities are greater than 45 meters, and the three types of obstacle sign lights can be used in conjunction with each other. Aviation obstacle indicator lights should be classified as below 45 meters above the ground, and low light intensity aviation obstacle lights should be installed in relatively open areas around them, with a constant red light. Buildings and facilities above 45 meters and below 105 meters above the ground: In use, the B-type aviation obstacle light with moderate intensity is a red flashing light, with a flash rate of 20-60 times per minute and an effective light intensity of 2000cd ± 25%. Use medium intensity A-type aviation obstruction lights above 105 meters and below 150 meters above the ground; White flashing, effective light intensity (2000-20000cd) ± 25%. Buildings and their facilities above 150 meters above the ground must use high intensity obstacle sign lights and must be white flashing lights, with a flash rate of 20-70 times per minute. The effective light intensity depends on the background brightness and operates 24 hours a day.