TThe Regional Intelligent Transportation Systems (ITS) Architecture describes how ITS applications in the Phoenix metropolitan region are interconnected and work. The process for defining and developing an ITS architecture must follow the National ITS Architecture (NIA). This is a national blue print established by the US Department of Transportation. The reasons for developing ITS based on a national plan are to ensure compatibility of systems and products nationwide, to have common standards and to advance new developments. The link to the ITS Architecture can be found under the Related Projects tab on the right.