The 250,000 sculpture stands taller than two double decker buses and is the work of international public artist Andy Scott, who was also behind the construction of the Heavy Horse on the M8 and the Falkirk Helix Water Kelpies.
Overlooking the A80 northbound, north of Auchenkilns Junction, the sculpture is of a female form.
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Taking almost a year to construct, it incorporates two large swooping arcs, inspired by the original name for Cumbernauld, "comar nan allt", which means "coming together of waters" in Gaelic.
More than 70,000 drivers will see the sculpture, named Arria, every day.
The name is based on Arria Fadilla who was the mother of Emperor Antoninus.
Cumbernauld lies two miles from the Antonine Wall and the town's new 40m shopping centre is called the Antonine Centre.