Photo Credit: John Kwa, May 2014, via Google Maps
In this instance, it's being used on top of what would have otherwise been 2 side by side buildings with offices.
One might say, this is the largest rooftop decoration in Laos! It connects the 2 buildings and creates an archway that cars can drive through.
You'll find it in on highway 13 at the Boten Border Customs Checkpoint between Luang Namta, Laos and China.