My apologies for the Twitter link. Appears to have happened around 1:30 EDT, judging from the timestamp in the video. Seems unsurprising that Amerikkkan infrastructure is in this dire of a state (at the cost of innocent people's lives, as usual), but I'd still love to know what the hell happened here. Hopefully the early hour meant that more people weren't harmed.
Photo of the aftermath:
Show
The bridge requires an even amount of weight to be on each pylon. If one pylon goes down all the weight shifts to the other and the whole thing goes down.
https://en.wikipedia.org/wiki/Continuous_truss_bridge
Thanks! I was trying to understand how the untappee pylon still caused collapse.