We can compare fatality rates from fires between countries with dual exits and those without: https://en.wikipedia.org/wiki/List_of_building_or_structure_fires

We can compare fatality rates from fires between countries with dual exits and those without: https://en.wikipedia.org/wiki/List_of_building_or_structure_fires https://en.wikipedia.org/wiki/List_of_building_or_structure_... We can also see if mass casualty fires in buildings stopped happening after the regulation change. https://en.wikipedia.org/wiki/Brooklyn_Theatre_fire https://en.wikipedia.org/wiki/Brooklyn_Theatre_fire https://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fire https://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fi... https://www.nytimes.com/1860/02/03/archives/calamitous-fire-tenement-house-on-elmstreet-destroyed-thirty.html https://www.nytimes.com/1860/02/03/archives/calamitous-fire-...