DOT Aims to Build First Avenue Tunnel Bike Lane Before September's UN General Assembly - Streetsblog New York City
Briefly

It is a very innovative concept. I don't know how many bike tunnels we have, maybe this is the first, to my knowledge. It's a great idea that cyclists should have an express lane.
Changes to the surface level are still in development, but will likely include an improved approach and exit, along with safer intersections at E. 45th and E. 47th Streets, according to DOT.
I don't have any design to be able to show you, because we're still trying to figure out, you know, the best way to be able to control traffic that's going up onto First Avenue instead of the tunnel,
Read at Streetsblog
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