https://en.wikipedia.org/wiki/Oresund_Bridge
The bridge and tunnel should have had a 3rd lane each way for busses. That way when the_train section is under maintenance, an express busway would already be in place. Plus, there should have been an emergency lane on each side of the tunnel. It's still far beyond what the BC part of Canada would do.
https://en.wikipedia.org/wiki/Oresund_Bridge#Drogden_Tunnel
https://en.wikipedia.org/wiki/Oresund_Bridge#Costs_and_benefits
