Tunnels don't really solve the problem well - they cost too much for what they do, and don't even do it well. Public transport (specifically expanding trains + e-bikes) is a much better, easier and already available solution.
Why didn't the workers cone off a lane from the street to make space for the bikes? Cars usually have easier alternatives, they can just take another lane.
EDIT: But anyway, the real viable alternative to cars is probably not bikes, it's trains and buses.
Because 1) literally no cars. And 2) there’s a bike lane on the other side of the road. The bike lane is bidirectional and the width of a car lane. All the parking in the street was removed for bike lanes.
Don’t quote me on this but the last time I checked it was roughly…
~600 deaths 35,000 hospitalisation due to car accidents.
~85 deaths 13,000 hospitalisation due to cycling accidents.
But in any case when walking in the city I feel safe walking with cars. But I don’t feel safe with cyclists. They rush through red lights. Rush through intersections while people are crossing. I’ve witnessed accidents occur due to cyclists not following the laws. If they followed the laws and slowed down. Stopped and gave way like they are meant to. I wouldn’t have an issue.
