Tom Taylor, Branch Chief of Surveys Coordination/New Technologies for Caltrans District 4, talks with the hosts about the advanced survey technologies used in rebuilding the I-580 ramp in Oakland, CA, totally destroyed in a tanker fire on April 29, 2007. This ramp is a critical element of the Bay Area freeway network. It was rebuilt in only 26 days in an extremely fast-track project that used innovative contracting methods and relied on extensive use of advanced measurement technologies. These included aerial photography and photogrammetry, laser scanning, and the use of advanced survey instruments for field measurement of the damage and exact position and dimensions of the remaining structure — thus defining the gap that needed to be filled by the replacement ramp