TRB’s Transportation Research E-Circular 208: Transformational Technologies in Transportation: State of the Activities explores the status and applications of transportation goods, services, and systems that fall under the umbrella of transformational technology. Key transformational technologies include connected and automated vehicles, including shared use services; unmanned aerial systems (drones); Internet of Things (including smart cities); and cybersecurity. In addition, the following technologies that have potential to be transformational technologies include NextGen, 3-D printing, and big data.