Yes...i it's the 4th time UKposts decided I need to see this. But maybe I will just go to bed then I guess.

I feel like larger and more dolphins could've lessened the damage.

I recall in a course at Penn State on Introduction to coal mining that the coefficient of friction between steel and steel was so low that the grades for rail haulage was limited to about 5%. Steeper grades were too slippery for a locomotive to pull. This was important to coal mine design. Haulage roads for trucks could be much steeper, which was a factor in necessary slopes in open pit mines. It was pointed out that locomotives had to be heavy to put enough pressure on its wheels for there to be friction for traction. My recollection is that a vector resolution of the coefficient of friction and the weight of the locomotive resulted in the backward component of the weight on a grade of about 5% equalled the available rolling friction.

I’ve been shadowbanned

So, basically, the root cause of the ENTIRE outage was line clearing crews not properly keeping trees trimmed well enough around power lines.

The key bridge was sad I was near it

No no no, it was a runaway top secret government experiment that sucked up too much power too quickly, which caused the blackout! 😂

notice the steel creating fire

I would say the oversight was not requiring attached tugs to control vessels of this size in tight waters like the Baltimore inner harbor. The regulation clearly failed to keep up with the size of ships.

Nice and quite in depth video of the Islands, thanks for sharing. It has been by humble opinion that all theses corporation has been tackling all their issues from the wrong point of view. There perspective has been and it all ways be their economics survival. While in part this understandable It will always will probably end the same way... the customer sharing all the brunt of some ones else mistakes. It needs to start at the sources; the electrical type and structures at the consumption point. All houses are wire like for 75 or 100 years ago. I think Europe is way ahead of us. Because of all the electronics we need to have DC (12, 19, 24 & 48 Volt system controllers instead of this been all over and under each LED Lights and AC voltages (120, 240 Volts & Single and thri-phase) Motors run much more efficiently on DC, consuming much less power. It is at the consumer houses that are the major issues that need to be fix first. Slow evolution its still in progress with no changes in site currently

Road Guy Rob is the goat love this collab

🫀🖤🫀

Bridge engineer here (PE and SE too) and thoroughly enjoyed this video. Great job on explaining how risk is accounted for in design.

there was time to warn the workers, but the city was too cheap to give them radios and the cops were too cowardly to go warn them in person

⭐🎵⭐

🫀💣🫀

Welp it's happening let's see tomorrow

R.I.P.

13:10 A normal distribution looks suspicious to me from a modelling standpoint, especially for accidents of these type. Surely a better choice is the Voigt distribution, which basically amount to the ship travelling straight (with a normal distribution for the horizontal displacement from center) until some point of failure where it takes a uniformly chosen random direction.

I bet the Dutch can solve it ;-)

Germany straightened almost all it's waterways, long story short, people are gonna lose their homes one way or another. Either we reallow the rivers to meander in their natural path, making the flood plains, flood plains again, renaturizing them, and removing entire living block stupidly build on same flood planes. The other option, nature is gonna destroy those homes anyway, not if, when is the question.

Nothing man made if fool proof and failure will occur. Whether nature caused or man caused. We do the best we can but shouldn't be spending exorbitant amounts of $$$. Leave the frills out, build in common sense safety. We should careless whether or not it pretty or has a magnificant silhouette. Make it functional and as safe as humanly possible.

Rob is way too happy!!! haha

0:44 the calculation f*ma was wrongly done 800kg *49m/s² =39.2tons thats approximately 40 tons not 4tons.

Nice ref to GTA V. Can’t believe how old that game is

As a Baltimore native, it hurt my soul watching the clip of the collapse... 😢

Shutting down the grid for a little while during the election won't cause to many problems. You are all on your way to extinction as it is so who cares. Welp, off to be a janitor.

Extremely interesting, well done

When this tragedy first happened, I looked forward to hearing your perspective. Glad you posted this video and I hope you post another one once more solid details are available.

Leaving another comment to say the Key Bridge was NOT in good health, the last report that came out for it, said the bridge was in "fair" condition. Not Great condition, so that was partly to blame for it collasping down on impact. I am sure there are other details I can't remember, but I did see the news reports about it.

Wouldn't a large Tesla valve be a good fish ladder?

Not showing f1 cars

I come here today to tell the eternally funny engineer joke: Aerospace Engineers build missiles. Civil Engineers build targets. 😂

Were the Amtrak train tracks on the bridge OK?

ok

wow rob the road guy is incredibly obnoxious. dont have him on anymore.

7:31 This picture is from the Almö bridge collapse, commonly known as the Tjörn bridge collapse in Sweden in January of 1980. Due to darkness (it happened at 01:30), fog, ice and strong currents, the Star Clipper hit the bridge om the Tjörn island side leading to the entire 300m main span collapsing into the water and partly over the ship. All crew were unharmed but seven vehicles including one truck drove over the edge and into the water. Eight people died. On the land side a truck driver who was driving extra slow due to the weather conditions managed to stop 10 meters from the edge when he saw that the guard rail was missing. Hej could stop the traffic from that side, saving several lives. On the island side, however it took about an hour before the bridge was closed. Several attempts were made to alert drivers, but sadly in vane.

Grady, your practical thoughts at the end of the video are very insightful, kind and truthful about humans and how to look at probabilities. Very wise. Thx.

Did you see the salt collection on the side of the road? A little tweak and we can use sweeper/ washing trucks to recollect that winter road salt to protect our environment from salt pollution

Hello Brady, I enjoy your channel very much. I sailed the waters under and around the Key Bridge and crossed the bridge a number of times during the years we lived in Baltimore. That makes it loss somewhat personal but putting that a side I do have a minor correction to offer not one that materially changes any of the substance of the video. You mentioned a single tunnel system but there are actually two tunnels under the approach to Baltimore, The Harbor Tunnel and the Ft McHenry Tunnel, the Harbor Tunnel being the older route and I believe predates the bridge, the Ft McHenry being newer.

Thank you for showing us Rob!

Remind me was it a British engineer who fixed it

Excellent job as usual explaining a complex subject so that us non engineers can understand it. I like the twofer part of including Road Guy Rob with his perspective too.

The bike lane on the bridge which just ends with a locked gate is peak US bicycle infrastructure.

Wondering why they haven't been removing many more containers from bow end of MV Dali to help make the salvage much easier?

When I was doing my engineering degree in Switzerland, back in the late nineties, we learned about bridge safety against collisions. Now, ships are not that much of a thing in a landlocked country, but railways are. For protecting the piers of a road bridge going over a railway line against derailments, there were 3 strategies: build no piers, but make the bridge span longer; armour the piers with collision damping structures; build the bridge so that a derailing train could wipe out a pier and the bridge would still stand (n-1 safety). The first two were addressed in this video, the third one, not sure how it could be possible to implement it on a bridge of this scale 😅

Maybe the solution doesn't rely on bridge protection but deflection, with airbags under the water and emergency pumps that create an artificial water current that would steer a powerless ship. The size and weight of these containerships are bonkers so deflection might be the only way to go. It is the usual case, if you know the exact disaster you are guarding against there is probably a relatively simple solution, but anticipating every and any scenario, that is more challenging.

What ya not have a tunnel

In South Africa we have adapted.

We did a DR for grid collapse in the banking sector. The scenario planning is downright frightening.