Showing construction of the ramp leading up to the flyover to go from I-85 South to I-385 South
Note the gray crushed-stone ramp, and the retaining walls on both sides.
The ramp and its retaining walls must be built up to match the level of the girders of the flyover.
These are stacks of the panels which are used to build the retaining walls.   They are stored face down; note the bolts used for attachment to the stays, which are buried in the gravel of the ramp.