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 obstruction lights, also known as navigation aid lighting equipment, are special lighting fixtures that identify obstacles and belong to the aviation aid lighting equipment industry. Aviation obstruction lights are the types of lights under their seats. In order to distinguish it from general purpose lighting, aviation obstruction lights are not always on but flashing, low intensity aviation obstruction lights are always on, medium intensity aviation obstruction lights and high intensity aviation obstruction lights are flashing, with a flashing frequency of not less than 20 times per minute and not more than 60 times per minute. The function of aviation obstacle lights is to display the contour of structures, enabling aircraft operators to determine the height and contour of obstacles, serving as a warning.