This document provides an overview of metropolitan planning organizations (MPOs) like the Transportation Planning Board (TPB), and the TPB's long-range transportation plan called Visualize 2045. It explains that MPOs are federally mandated organizations that work with state and local stakeholders to develop transportation plans and programs through a cooperative planning process. The TPB serves as the MPO for the Washington DC region, developing plans like the long-range Visualize 2045 to guide regional transportation priorities and projects over a 20-year horizon. It also outlines the timeline for completing and approving the updated Visualize 2045 plan in 2018.