The engineers who designed that machine were very sure of their math and the crews that work with that machine are very trusting.Super cool to see this done!!! another one of life's mysteries solved.This would have been described years ago as "an engineering marvel". Never find a better example than this. Kudos.In the UK we would get around this problem by simply promising the project at election time and not carrying it out.I was just mesmerized for 4 min of my life. One of the coolest videos I've ever seen. Brave souls, those bridge workers..