TRB’s National Cooperative Highway Research Program (NCHRP) Synthesis 297: Building Effective Relationships Between Central Cities and Regional, State, and Federal Agencies documents various intergovernmental relationships and practices that have proven successful in furthering the capital, operations, and maintenance needs of urban transportation systems. It addresses questions about how various intergovernmental units work together to address the transportation needs of central cities, what types of relationships have proven successful in achieving this goal, and what practical steps local, regional, state, and federal officials can take to enhance and improve central city transportation systems.  This topic is  published at https://www.trb.org/news/blurb_detail.asp?id=2394