Transition to Short-Term Planning
As planning for the Interstate Highway System was being completed, attention turned to increasing the productivity and efficiency of existing facilities. In planning for major new regional transportation facilities, many urban areas had neglected maintaining and upgrading other facilities. However, environmental concerns, the difficulty of building inner city freeways, renewed interest in urban mass transit, and the energy crisis gave added impetus to the focus on more immediate problems. Signs were becoming evident of the changing emphasis to shorter-term time horizons and the corridor level in transportation planning. Gradually, planning shifted toward maximizing the use of the existing system with a minimum of new construction. Further, the connection was strengthened between long-term planning and the programming of projects (Weiner, 1982).