"Construction of the new span, which carries eastbound traffic parallel to the current bridge, began on October 4, 2002, and was completed in July 2007." https://en.wikipedia.org/wiki/Tacoma_Narrows_Bridge#Eastbound_bridge_(2007)
Although this is getting close to the BC part of Canada, it wasn't constrained by any of the imposed BC limitations.
"Towers and caissons designed for second deck (either road or light rail) to be added in the future." https://structurae.net/en/structures/new-tacoma-narrows-bridge
If only BC would allow for such future expansion capabilities. There are a whole series of things that are able to be done in Washington State & Alberta, simply because they aren't under any BC type restrictions.
