 The RTP combines research, plans and programs by various organizations into one comprehensive plan which is updated every four years.The RTP's main aim is to identify long-range transportation needs, prioritize programs and projects and to provide a forum for dialogue and regional problem solving.The Houston-Galveston Area is one of the fastest growing metropolitan area in the United States, with a projected rise in the region's population by 3 million and the creation of 1.5 million new jobs.