The Regional Advisory Committee (RAC) and four Area Advisory Teams (AAT) play instrumental roles in advising project officials and engineers. The RAC is made up of business, civic, recreational and environmental organizations whose focus is on region-wide impacts. The four AATs, representing each of the four approach design areas, serve as points-of-contact for their communities and meet with officials from CTS-GEC and the appropriate Section Design Team to periodically review progress and make recommendations. Section 106 of the National Historic Preservation Act (NHPA) requires federal agencies to take into account the effects that their federally funded activities and programs have on significant historic properties. The Bridges Project works closely with numerous organizations to meet this requirement.