Here’s an article in the Seattle PI about a proposed tunnel as a replacement to an elevated highway that currently exists.
The caption on the picture.
The tunnel option to replace the Alaskan Way Viaduct would have two lanes in each direction and would extend from approximately South Royal Brougham Way to Harrison Street. This scenario also includes a pair of northbound and southbound one-way streets using Alaskan Way and Western Avenue.
A portion from the article.
The new four-lane highway also would be double-decked inside the tunnel, which would be bored under First Avenue and extend from the sports stadiums to Harrison Street, north of the Battery Street Tunnel.
And the picture:
Let me begin.
1. The picture obviously does not display a tunnel.
2. It isn’t double-decked.
3. There are 3 lanes of traffic on each side. Not 4 lanes. Even if we assume that they meant 2 lanes in each direction, which is what I believe is in the proposal, there are clearly 3 lanes on each side.
4. Both directions of traffic are on the same plane.