On July 18, 2013, in response to petitions submitted from Highway Information Systems, Inc. (HIS), the American Association of Information Radio Operators (AAIRO), and the American Association of State Highway and Transportation Officials (AASHTO), the FCC adopted Report and Order 13-98 updating and clarifying the regulations applying to TIS stations. The Report and Order, as summarized by a May 2014 Compliance Guide (DA-14-651), approved the establishment of "ribbons" of sequentially located roadside transmitters so long as content remained pertinent at all points. This also clarified that programming content must relate to travel, emergencies or situations of imminent danger to the public, and that it is at the discretion of station operators, based on their knowledge of the area and its population, of what situations present an imminent danger.