This document discusses opportunities for improved regional transit cooperation in Southern New England and the Northeast Corridor megaregion. It notes that eight of the ten densest US states are located in the Northeast Corridor. Addressing issues like traffic congestion and air pollution requires coordinating transportation planning and services across state and county lines. The document then focuses on opportunities for regional cooperation in three specific areas - Southern New England as a whole, the Knowledge Corridor region between Springfield, MA and New Haven, CT, and the metro Hartford, CT region. It discusses integrating services, fare payment, and mobility options across these regions.