Hello; Bridge technology improved. 50 years back there is professional in ap after 1985 it was became as politicalisam. He has spoiled all the systems.every body says he has build up a great cader. Take all cader history where they came how they earned How much what business they have done.wonder full things will come out. Great tech video. But in Africa, the bridge that South Korea built collapsed. I was very disappointed. Now, imagine doing that, but spanning Mississippi River instead with six lanes east bound and six lanes west bound. That’s what I’ve been watching for at least two years! Fascinating to see the giant equipment out on floating barges.