The size and complexity of transportation hubs bring a multitude of technical challenges as they race to upgrade outmoded audio, or digital signage. One major concern is the ceaseless movement of passengers, which necessitates careful planning to avoid disruptions. Meanwhile, gathering crowds of people under one roof demands protection against potentially catastrophic security and fire risks. Another priority is integrating the latest technology with both legacy systems and sophisticated new equipment from other brands. The long catalogue of potential stumbling blocks goes on, with pollution and humidity also demanding protection in some instances.