Collapse of the Second Narrows Bridge during its Construction in 1958

 https://ascelibrary.org/doi/10.1061/9780784481035.014

Unfortunately, when the bridge was rebuilt, there was no concept for a couple of bus lanes.

https://pressbooks.bccampus.ca/engineeringinsociety/chapter/infrastructure-disaster-ironworkers-memorial-bridge-vancouver-1958

There should have been at least 2 emergency lanes, but it was decide to just jame everything into only 3 lanes each way.

https://www.nsnews.com/in-the-community/time-traveller-19-die-in-1958-second-narrows-bridge-collapse-and-ensuing-rescue-5462583

https://vancouversun.com/news/this-day-in-history-june-17-1958

https://www.thecanadianencyclopedia.ca/en/article/second-narrows-bridge-collapse

https://news.gov.bc.ca/releases/2018TRAN0045-001202

https://www.ironworkers.ca/58-years-second-narrows-bridge-collapse-lost-lives-not-forgotten/