https://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1940) Just a 2 lane blunder.
Of course a stronger & wider bridge should have been designed in the first place.
https://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1940)#Collapse
It was such a narrow & inadequate bridge that it rivaled the very narrow Lions_Gate_Bridge.
https://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1940)#Cause_of_the_collapse
Eventually, a bigger & better bridge was built.
https://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge_(1950)
Then eventually twinned, something that's almost unheard of in BC.
