Drivers can't see the progress because of the sound wall, but it's getting there. So far, 900 of the 4,400 ft. of tunnel have been drilled. When it is done, it will add two lanes to the tunnel, easing reverse-commute congestion.
The expansion work will cost $391 million dollars.
The expanded Caldecott Tunnel is expected to make life easier for approximately 160,000 drivers.