One Bay Area is the initiative of the four regional agencies in the San Francisco Bay Area to implement the path-breaking 2008 Senate Bill 375's requirement for Sustainable Community Strategies. "The law calls upon metropolitan planning organizations (MPOs) in 18 regions in California to develop an integrated transportation, land-use and housing plan known as a Sustainable Communities Strategy (Strategy), with the ultimate goal of reducing greenhouse gas emissions for cars and light-duty trucks. In the Bay Area, this involves the Metropolitan Transportation Commission (MTC), as the MPO, and the region’s Council of Governments, the Association of Bay Area Governments (ABAG)."