It’s only a guess but I think the cause is right there in your picture. That semi-trailer appears to be filled with gravel. If so it might be close to 50 tons. Add that to a bridge support made with inferior concrete and rebar and you might find a support catastrophically failing.
Rep. Hank Johnson from GA was right - too much weight WILL make THINGS tip over!!!
Why is this called a suspension bridge? My idea of a suspension bridge is the Golden Gate and the Bay Bridge..
In China they call these Tofu Construction Projects
the sad thing is, the Chinese just accept it as the way life and Governments are. They havent known anything else.
They have an all-controlling, all-corrupt, elitist, central-planning Govt, where apparatchiks and cronies skim the cream off the economy.
I see the USA heading towards an American version of the same thing.