Research and report on the intersection of sustainability and historic preservation, focusing on identifying the benefits of reinvesting in older, historic transportation infrastructure and in maintaining existing facilities in America’s historic neighborhoods as essential aspects of smart growth & sustainable transportation planning.  The current emphasis on sustainability and livability, and the current economic downturn, require transportation planners to keep costs under control, and to identify opportunities to preserve and adapt existing roadways and bridges to meet modern traffic needs. Research should examine how both preservationists and transportation planners can use existing planning tools to promote stewardship of America’s historic neighborhoods and traditional modes of transportation, and in so doing create (or reuse) more sustainable systems to move people from one place to another.  Research should include recommendations for improving the consideration of historic properties in transportation planning and the use of alternate modes of transportation to keep traffic from overwhelming existing facilities. Research should also include case examples supporting the conclusions and recommendations.