<p>Left is April 2013 and right is May 2014.
</p>
The project includes updating electrical systems, lighting system, control system, ventilation system, structural repairs to the walls and arched ceiling, installation of a water line and other improvements. To minimize impacts on the traveling public, rehabilitation work on the bridge that carries the Parkway East over Commercial Street will be performed as part of the tunnel project. Expansion dam on ramps at the Edgewood Swissvale interchange (Exit 77) will also be replaced. Overall work will conclude in summer 2014.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/daveynin/14162032551/">Squirrel Hill Tunnel Rehabilitation: Before and After</a>