Excellent! Clear, concise overview of key construction segments. Very interesting and informative! Thank you for taking the time to share this amazing information.

I worked as Senior Inspector of Works on the Kuala Lumper Smart Tunnel in Malaysia, designed as a flood relief tunnel but a contractor put in a bid for a dual use flood and double deck roadway tunnel. Escape routes were constructed outside the tunnel ring and included a stairway to connect the upper and lower road decks, watertight for use when the tunnel was closed to road traffic and used for flood relief. This method also left room for two lanes in each direction and an emergency walkway at the side. There were also watertight doors installed at the traffic entry and exit points. Road tolls will pay for the extra works required to make it a road tunnel. I'm told it takes about two days work to clean and replace damaged fixture after each flooding. Lighting etc. were chosen to be cheap and easy to replace, rather than very expensive units that still may get damaged. The tunnel has reduced driving times in the rush hour times and improved traffic flow. As with the Seattle tunnel the road decks were constructed during tunneling using mainly cast insitu systems.

This is amazing! Intelligent team work I had never imagined!

Well done video and the replies by wsdot have been very informative. Thank you. The tunnel opened for traffic on February 4, 2019.

It's open now and after just a few months, it's obviously too small. Brilliant work WSDOT.

Excellent presentation!

Very impressive.

8 jealous engineers from other states disliked this video

Very interesting.

get to see america built again

Nice presentation! Curious why the corbels appear vertical/horizontal and not perpendicular to the segments for even strength?

Epoxy covered rebar is proving to actually be worse than bare, hot dip galvanized seems to be the best (after basalt, which has limitations and is expensive).

i just can’t wait till most of the construction projects are done in seattle. traffic is a nightmare and road/lane closures due to construction is not helping.

my sister is building this. get it sister love u moe

Why does the upper roadway have walls? Why can't they just be the tunnel walls? Anyone know?

brilliant!

exciting

This is not my field but it's good.

What happens to the dirt removed by the TBR? Does it fall directly in truck? Is it store in the TBR?

Why not put a train line there too?

Isn’t this thing complete yet

epic.

Can you guys come build some roads in Arizona, the workmanship out here is just disgusting and upsetting

incase of block or fire inside are they any emergency exit door in the tunnel for drivers?

Why dig a very wide tunnel to stack the roads, why not build two seperate tunnels like how most underground highways are built

Cool indeed but is it needed? How about public transportation instead? I mean the costs here with this project are enormous beyond words.

Tunnel has no exits like the viaduct so you have to pay a toll to double back. This is a tourism & aesthetics project, not a commuter project. Unlike the Narrows and 520 bridges absurd tolls, they can't keep jacking up the crossing price without risking diversion. Right now drivers using the tunnel will be looking at a monthly hit to the wallet at between $40 to $80. And thats just in the beginning. If commuters divert like on 520 they will stick it to you even more.

So who ever owned a condo...just saw its value increase at the expense of the taxpayer!

They built a single tunnel for a major highway right next to _and under_ waterfront property... within a major-threat earthquake zone. The alternative- a raised six-lane bridge to replace the old one- would have been far faster, cheaper and safer to both build and maintain. And keep this in mind: the Seattle residents who pushed so hard for this tunnel (so it wouldn't obstruct their _wonderful_ waterfront views!) are the exact same people who have successfully kept the rest of the city a half-century behind by shooting down the desperately-needed monorail expansion... which had been approved by state voters _four times._ #NotImpressed

Building a highway no one wanted and installing tolls both in the tunnel and the struts above. You guys are crooks

This is for the secrecy of shipping things that need a time schedule and part of prep for something strange. . what they say its for is probably a lie

So, they are boring a tunnel to replace the double deck highway that may collapse in the event of seismic activity and then building a double deck highway inside the tunnel? The whole thing sounds silly. In the end you still have a double deck highway that may collapse in an earthquake. Only now they won't have to bury you when you die, you'll already be buried in a mass grave.

Theres no way the public is gonna use this. Police wouldnt be able to get to anyone