Crews pushed three massive precast concrete boxes into place with hydraulic jacks underneath an active highway in Brevard County, Fla., during the week of March 29 as part of the $4-billion Brightline high-speed rail program that will extend the line to Orlando from Miami and West Palm Beach.

Officials believe it is the first time the box-jacking method, first used in the U.S. on the Long Island Rail Road Extension (ENR 9/2-9/19 p. 18), has been used under live highway traffic.