Virginia DoT faced a challenge common to many highway authorities around the world: the need, in economically challenging times, to replace ageing variable message signs reaching the end of their operational life. For some 25 years now, since the mid 80s, Virginia Department of Transportation (VDoT), has deployed variable message signs (VMS) as part of its motorist information systems. Throughout the state there are still many old 'flip-disk' signs. Some of the companies that provided these electronic messa
