Operation Stack - which reserves part of the coastbound motorway for lorries to park before crossing the Channel - has been in place since early Tuesday.
We were even more surprised to see who was running this attraction -- the indigenous Nanu Indians who live near this national park and operate the mock border crossing.
The process for seeking approval from federal agencies is so disjointed and slow that pushing a line over a national park or river might as well be crossing the Styx.
The artwork, by Nigel Hall, is called Crossing (Vertical) and has been loaned by Yorkshire Sculpture Park (YSP) for the new community gardens in Barnsley.
This is the start of the High Line Park, the first section of which opened in June 2009 and stretches north, crossing over 10th Avenue and through the Chelsea Market to West 20th Street.
Phase two - opened on Thursday - is the longest section of the road, crossing the Clyde at Rutherglen Bridge and passing Dalmarnock Railway Station, the Commonwealth Arena and Celtic Park before joining the Parkhead by-pass at the Forge Retail Park.