The site comprises a set of giant LED screens across a four lane arterial route that Ocean Outdoor claims is the first such placement of its kind.
The screen is located on the West Cross Route, a short, dual carriageway section of the A3220 route in central London.
Damian Cox, chief executive of Ocean, said the company is determined to "build the best panels with whatever technology allows our clients unparalleled standout".
Ocean secured the contract for the external advertising at Westfield last October and has so far unveiled three 12x3m digital screens at the Holland Park roundabout and a banner above the car park entrance.
Further sites are currently in the planning stages.
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