The provisions of the Code are not retroactive except as specifically provided hereinafter; provided however, that any device covered by this Code, found to be in a dangerous condition, or if the design or method of operation in combination with devices used is considered inherently dangerous, or if there is an immediate hazard to those riding on or using such equipment, it shall be the duty of the Department to notify the holder of the operating license of such installation in writing of the existing condition and to order alterations or additions as the Department finds are necessary to eliminate the existing dangerous condition.