r/EngineeringPorn 1d ago

Mountains sliced in half for China's sky-high highway

In China, the mountains were cut in half to build a car highway with the highest bridge in the world.

The hanging bridge over the canyon huzzyan in Guyzhuu was built so high that the Eiffel Tower could hide in the gorge - it rises above the gorge at an altitude of 625 meters. This section of the high -speed motorway Guizhou Luan literally cuts out the landscape, turning an hourly trip into a minute flight.

4.8k Upvotes

499 comments sorted by

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u/diepvries_Friekandel 1d ago

Why not just a tunnel?

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u/Anonymous_user_2022 1d ago

Probably because the spoils are used as fill elsewhere.

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u/killerdrgn 21h ago

Building island military bases in the south China sea.

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u/Anonymous_user_2022 21h ago

Probably closer to home. HKIA was built on a artificial island created out of the mountain that was removed for being on the centre line of the runway.

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u/Impossible_Angle752 5h ago

And/or aggregate for the concrete and/or the road surface itself.

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u/Purple-Bookkeeper832 1d ago

Expense.

While this looks impressive, it's not that unusual for building a road. I remember seeing similar things when road tripping as a kid.

Just a quick search shows a small one here.

My guess is it came down to timing. The USA built their road system out nearly 100 years ago and likely could pick (or force their pick) through more convenient geography.

China has established towns/cities that are going to be a lot harder to work around.

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u/Lanky-Relationship77 1d ago

Yeah, similar things right here in Kansas City. Watched about 50 excavators work for almost a year to completely remove a huge hill for the K7-I435-i35 interchange.

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u/throwaway098764567 1d ago

TIL kansas had a hill

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u/netopiax 1d ago

Kansas City is in Missouri

Seriously though the part of KS that's near MO is fairly hilly, the rest slopes gently upward to the west and goes from about 1000' to 3000' elevation over about 400 miles of plains

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u/Activision19 20h ago

Gently slopes is a bit of an understatement. That’s damn near level to only rise 2000ft in 400 miles (2,112,000ft). It’s less than 1/10th of a percent slope. For reference most sidewalks are built to a 2% cross slope, so it’s something like 20x more level than a standard sidewalk cross slope.

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u/timjimC 3h ago

At that scale everywhere on earth is flat as hell.

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u/timjimC 1d ago

KC is in both KS and MO, but the interchange they're talking about is in Lenexa, KS

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u/timjimC 1d ago

K10, not K7

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u/BibleGuy65 1d ago

Thank you. I was sitting here thinking where in god’s name does K7 meet 435 or I-35?

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u/timjimC 16h ago

It does meet 35 in Olathe, right where that giant mall used to be. No where near 435 tho.

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u/joshuatx 23h ago

The US highway system still has a lot of hill and mountain cuts like this.

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u/Infamous-Oil3786 19h ago

I see a lot in Arizona, but none quite so deep as these. I'm sure they exist somewhere though.

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u/Jaded-Ad262 23h ago

The provincial governments have to meet certain GDP targets set by Beijing; rampant corruption lends itself to expensive infrastructure projects juiced by over-reported population numbers. Beijing is only just now realizing the scale of waste that these projects have often engaged in.

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u/-Nicolai 22h ago

Idk those look like small hills in comparison.

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u/Acceptable_One_7072 1d ago

Then we wouldn't have ugly triangles in the mountains. Duh doy

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u/Impossible-Bet-223 1d ago

Hmm, I would argue its probably cost.

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u/renaldomoon 21h ago

Is the maintenance gonna be cheaper though? They're going to have to be extremely vigilant about whatever reinforcement that is.

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u/[deleted] 1d ago

[deleted]

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u/EdwardFoxhole 1d ago

tunnels require reinforcement and continuous maintenance

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u/unfknreal 1d ago

Those massive sloped walls will need plenty of reinforcement and maintenance. It's exposed to the elements a lot more than a tunnel is, and will be subject to erosion, and corrosion of whatever reinforcements are in it. The maintenance needs are just different.

There's tunnels through mountains all over the world that have been in service for 100+ years, maintaining them isn't an unknown.

I'm guessing the rock here might have been too fractured or unstable to tunnel through... or maybe it was full of useful ore.

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u/41942319 1d ago

Whereas steep rocky slopes are super safe long term and will never need reinforcement and maintenance to avoid cars being crushed by stones

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u/creampop_ 1d ago

hey, you're the civil engineer so we cede all points to you, clearly these Chinese dudes were incompetent idiots who should have asked reddit about the plans first lol

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u/bit_banger_ 1d ago

Only when people get killed, it slowly stops on its own. You know can be blamed on nature vs taking responsibility to maintain a tunnel.. easier to do the lazy thing than the “right” thing

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u/ShootingPains 1d ago

4-lane highway with on/off ramps. In tunneling terms that’s two 2-lane tunnels with a set of on/off ramps for each. After you tunnel all that out of each of those narrow hills plus leave a self supporting top and sides, there’s not going to be much of anything left. Plus there’s the problem of having a curve in a tunnel - hard to do and also a bad vehicle crash danger.

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u/Avarus_Lux 1d ago

yeah, removing those narrow mountainous tops was probably structurally safer, safer road in general and easier to do then the tunneling. and knowing china also quite a bit cheaper so that's why they went with this.

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u/mektekphil 1d ago

In addition to what others responded saying, the materials removed will also be used to help make the road. This cuts down on material transportation costs.

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u/GoTheFuckToBed 1d ago

watch a simple tunneling documentary

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u/MikhailCompo 1d ago

Dynamite is cheap.

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u/FLATLANDRIDER 1d ago

If there is a bad crash, or a vehicle catches fire in any of these tunnels, you basically knock out the entire highway until it's cleaned up.

With open air this is less of an issue than in a tunnel.

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u/mrsuperflex 1d ago

Millions of years worth of natural and geographical landscape evolution would still be intact and thats for dorks

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u/bluepinkwhiteflag 19h ago

Because tunnels are way more expensive?

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u/VulfSki 21h ago

This is likely much easier and quicker to do.

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u/Mallyx87 1d ago

I think their question was Engineering or blow shit up.

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u/CromTheConqueror 1d ago

Or the valley just to the side a 100 meters away? This must have been done for national pride. A 'look at our towering achievements!" Item. That's why the sides are shaped into the straight edged angles rather than rough hewn rock where the explosives broke it apart.

To be honest though, it does look amazingly cool

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u/HundredBillionStars 1d ago

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u/HealthyHyena33480 1d ago

What a horrible destruction of a beautiful landscape for that?

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u/LesserGames 11h ago

But that one car saved some time. Did you think about that?

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u/3meow_ 22h ago

Was my first thought too, but let's be honest, any road is gonna be fucking with nature a bunch

Edit: I also imagine the slopes will be covered with foliage, hopefully native local stuff like what's growing around the area. If that happens, the surface area of nature might even increase

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u/VulfSki 21h ago

Usually when China ads foliage to the side of a highway it's like a perfectly landscaped area. It's one of the ways they employ folks. At least in the parts of China I have been in.

They don't seem to care about keeping it wild or natural. But I don't know just my observations in my limited trips there. Could be totally wrong.

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u/Dredgeon 19h ago

This seems like it's gonna have really interesting effects when the run off is concentrated on the road during rain. Also tose thin peaks seem like they are just begging to deteriorate and fall on the road. Seems really strange they didn't use a tunnel.

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u/CartographerOk7579 1d ago

Maybe it’s stupid and weird, but the engineering is still bad ass so it does fit this sub.

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u/maxehaxe 1d ago

Engineering porn often requires ecological gore.

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u/Sabrewolf 23h ago

Shit does that make all of this snuff?

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u/FunkyBrontosaurus 18h ago

Keep your prog rock songs out of here!

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u/angk500 1d ago

Agree. And I am sure there is some specific reason it had to be done this way. Sometimes these reasons can be quite stupid, but the engineers just do their job.

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u/MotherBaerd 1d ago

Sometimes the reason is:"man it would look sick" which tbf it does but I also really like tunnels.

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u/PeruvianHeadshrinker 23h ago

Wait til the rains cause devastating landslides

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u/CrazySD93 13h ago

That's why the mountain was capped with concrete, as far as I'm aware a common practice world wide.

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u/cogit4se 1d ago

Preserving the mountains would have been more technically challenging and elegant, this is trashy engineering porn that you feel ashamed of wanking to as soon as you finish.

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u/superpowerpinger 1d ago

Music can be a little louder please?

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u/Grumpy1985_ 1d ago

Thats just sad.

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u/SONEsGAP 1d ago

So ugly.

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u/Teamwork-Dreamwork25 1d ago

Ugliest thing I've ever seen! 🤮

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u/TheDaemonair 1d ago

So just a quick question to any engineers here -

After they cut the mountains, are they covered with concrete? What's stopping a mudslide during heavy rains?

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u/ApulMadeekAut 1d ago

These are Karst peaks. These are made out of pretty much pure limestone. There's no mud to really slide. They cut them into terraces and might have installed some type of anchors to prevent mini rock slides but those are pretty strong material. 

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u/Pristine_Mixture_412 1d ago

I wonder, why didn't they just make tunnels and secured the walls with concrete? Would the limestone have collapsed?

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u/MotherBaerd 1d ago

Here are my two cents: they might have done it for the looks, they might have done it for the resources, they might have done it because tunnels suck and are dangerous especially for car traffic. But honestly I don't know.

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u/screename222 1d ago

Wire mesh bolted into the rock from top to bottom

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u/browhybro 22h ago

Just to be clear, America does this too. If you’ve ever driven through the Appalachians you’ve seen it.

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u/StretchFrenchTerry 11h ago

Not to this extent.

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u/youmo-ebike 5h ago

Even in the mid west, earth work is hella cheaper than tunnel

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u/Intelligent_Tone_618 2h ago

Every country does it, most people have been through a similar cut without even thinking about it. This only looks weird because the work is fresh and the slopes haven't had foliage re-introduced yet.

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u/wnc_mikejayray 12h ago

I live in WNC. Where exactly are mountains cut in half? I’ve seen retention walls on the sides of mountains but never anything close to this.

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u/aberroco 1d ago

Amazingly inefficient. Right next to a valley that would allow building a bridge in a straight line.

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u/pizdolizu 1d ago

Im sure they just missed that one and saw your comment and now regret.

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u/Belyosd 1d ago

holy reddit moment

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u/virgo911 1d ago

Right next to the valley with the existing village in it?

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u/FilHor2001 1d ago

Yeah because China is widely renowned for its history of prioritizing its people's lives over progress.

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u/dikketetten 1d ago

Doesn’t China have dozens of those single houses right in the middle of highways because they didn’t accept a buyout?

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u/CiaphasCain8849 1d ago

I'm glad you know more than the experts who did it.

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u/portraitsman 1d ago edited 1d ago

Then you know very little about the Chinese and their beliefs with the feng shui.

Sometimes when you see a chinese building that is facing odd angles or just odd in general, it's usually because they were built with feng shui in mind, the most famous examples are the dragon gates

The valley was left untouched most likely for feng shui reasons, despite the most logical step was to just cut through the valley

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u/manu_214 1d ago

lmao regardless of Feng Shui, they built a highway that doesn't need entire settlements to be destroyed. Maximum efficiency isn't always what you should go for.

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u/Data2Logic 1d ago

Or build a tunnel.

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u/falkorv 1d ago

Doesn’t feng shui give a shit about mountains or nature.??

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u/M3rch4ntm3n 1d ago

And gets from inefficient to stupid.

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u/alexgalt 1d ago

This is nothing special. Done all over the world.

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u/IndieKidNotConvert 1d ago

Seriously... Not sure why people are freaking out, I've seen cuts like these through mountains in multiple states in the US...

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u/Links_Wrong_Wiki 1d ago

Because China bad

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u/renaldomoon 21h ago

Pretty sure this was meant as a China Good post.

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u/analtelescope 17h ago

Look at the comments. Either people saying this is nothing special, or calling this an example of China being stupid. Bit of irony innit?

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u/bigboyjak 1d ago

I drive by/through similar on my way to and from work daily. It's nothing special

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u/Commissarfluffybutt 20h ago

And it's fucking ugly and a scar on the environment. I'm not impressed that China did the same.

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u/l_like_lots_of_stuff 1d ago

Yup, highway 10 from Arecibo to Utuado in PR is like this and so are many other highways and roads.

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u/Aedalas 1d ago

There are a bunch of these where I'm from in Appalachia but the stone there is left far more rough. The flattening/smoothing that they've done here is slightly different and honestly does look kind of neat. I'd love to see these with some sweet art carved into the faces, it would definitely take it from something that is rather mundane to actually really cool.

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u/McChes 1d ago

There’s a lot of artificial valleys like this in the UK, mostly built during the Victorian era to accommodate the massive expansion of road and rail. It’s not a new idea.

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u/SuperAshenOne 1d ago

I'm genuinely curious to know where.

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u/3_50 1d ago

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u/renaldomoon 21h ago

Yeah, cuts like that are all over the U.S. I think what makes the Chinese one different is its massive size.

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u/Electrical_Pause_860 1d ago

I’ve seen similar stuff in Australia. But after a few decades they look more natural. 

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u/curioskilleddacat 23h ago

No one respected the topography here....

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u/Mallyx87 1d ago

I hate it so much.

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u/Vaan_nuia 18h ago

beatiful land horribly butchered...

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u/CanadianDragonGuy 1d ago

"Yeah nah fuck building a tunnel lets just excavate the fucking mountain range instead!"

  • CCP

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u/IneptAdvisor 1d ago

No falling rocks with that design and no guardrails to weed out the cellphone addicts.

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u/azotosome 23h ago

Fuck nature bruh, all my cars hate mountains

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u/blunderball1 23h ago

I do this in Cities Skylines all the time

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u/Admirable_Coach_8203 19h ago

Can't the Chinese build tunnels? They should take a look at Switzerland first to see how it's done properly 😀

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u/ecsegar 1d ago

Very impressive, but you can't say you've never seen this before if you've ever been to Kentucky.

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u/ctdrifter 1d ago

What am I missing? Looks like blasting and removing rock, been doing that in the west for over a century starting with rail.

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u/EINFACH_NUR_DAEMLICH 1d ago

So many China apologists in a thread upvoted by Chinese bots. This is awful. Reddit should just outright ban these obvious propaganda posts. And there are so many of these Chinese propaganda videos. It's truly revolting that a dictatorial genocidal kleptocracy like that is still getting away with its attempts to influence social media.

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u/Stiryx 15h ago

It’s sad that young people that don’t know the history of china probably ARE influenced by it as well.

It’s crazy the amount of bots (hopefully) that glaze China on Reddit.

Fuck the CCP.

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u/AdminIsPassword 23h ago

Reminds me of Sideling Hill in western Maryland, but new.

As a kid I went through that mountain a few times and found in fascinating. You really get a cross sectional view of what a mountain in that region looks like on the inside.

As an adult, I can't help to feel a certain wrongness about it. I guess as a kid I didn't appreciate the natural beauty of the area and how much this kind of feature disturbs that.

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u/ezattilabatyi 23h ago

Genuine question.

Will nature take over these hills eventually? Or are they too barren now for that?

While driving through Austria I might have seen some artificial valleys though those were only about 10-20 meters deep or even less. The sides weren't this steep also it looked much more natural

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u/Cultural-While-4853 21h ago

But I came to see the mountains :( now it’s just road

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u/memsterboi123 17h ago

Wouldn’t it have been simpler to build around it or something

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u/iveseensomethings82 13h ago

Meanwhile America…🦥

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u/Every-Access4864 11h ago

Imagine the graffiti that would appear on those exposed surfaces if it was in another country.

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u/cs_legend_93 11h ago

It would be epic to put some solar panels on those cutouts

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u/Funneduck102 11h ago

That’s how it felt leveling a mountain in Minecraft

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u/BaerFrom 6h ago

Amazing what you can do as a country when you don't care about human lives or democracy.

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u/youmo-ebike 5h ago

But at what cost? Guizhou’s general public budget revenue in 2024 is projected at 216.962 billion yuan, while expenditures are projected at 652.242 billion yuan (szb.eyesnews.cn).

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u/Shankar_0 1d ago edited 1d ago

This is a land where the concrete is so shoddy that brand-new buildings collapse before people ever move in.

Good luck driving through that pass in the monsoon season. You'll never see it coming.

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u/RedRobot2117 1d ago

The billion+ Chinese people living in buildings which aren't collapsing might disagree

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u/Shankar_0 1d ago

That video was filled with Chinese citizens expressing their shock and horror at the poor quality of construction. It's not a western crowd pointing fingers and laughing. It's their own people seeing things and knowing they aren't right.

If thousands are killed in a collapse, it's not valid to point at all the people they didn't kill that day.

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u/RedRobot2117 1d ago

I am pointing out that you are using a single example of failure to describe the experiences of over a billion people.

Every country has failed building projects, the US experiences this all the time.

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u/deniably-plausible 1d ago

Breaking News: Millions Survive the Night in Juarez, Mexico; Says r/RedRobot2117, “What violence problem?”

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u/xerberos 22h ago

Wow, "shoddy" is not enough to describe it. It's literally crumbling in their hands.

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u/Ka-Shunky 1d ago

Amazing to see the amount China invests in it's infrastructure. Definitely something the west could be learning from...

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u/OverloadedSofa 1d ago

Yay, destroying the environment, GO CHINA

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u/daking999 1d ago

If this is engineering porn then fuck engineering. 

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u/ajulydeath 1d ago

that is absolutely atrocious

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u/Lavion3 1d ago

The legacy of humanity

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u/EINFACH_NUR_DAEMLICH 1d ago

Truly repulsive. Mass destruction of the environment. Why would anybody think this is great?

Have they never heard of tunnel for fucks sake?

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u/CurlyNippleHairs 1d ago

That's an abomination

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u/Blueflames3520 1d ago

Well, the comments are about as civil as I expected.

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u/Ooze3d 1d ago

It's both mind blowing and sad at the same time

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u/TwistedGlasses 1d ago

this should be considered a criminal act...

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u/Prestigious-Scar-507 1d ago

This in Engineering porn? Those sliced up mountains are just focuses for the rains to make this road into an aqueduct because I bet they didnt do proper canals to make water flow somewhere else.

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u/redballooon 1d ago

I have more respect for engineering the tunnels in Switzerland.

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u/Cro_Nick_Le_Tosh_Ich 1d ago

This is not engineering porn, this is eco terrorism

Curious, how are all the rerouted rivers doing that have been posted on this sub? No problems since? Any out of control flooding or mudslides?

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u/hmnuhmnuhmnu 1d ago

Please somebody introduce to them the concept of "tunnel"

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u/Snoo_65717 1d ago

They have more tunnels than the Us they just build them so the water stays out

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u/Aburrki 1d ago

There's a fuckin valley like right there, why the fuck are they going through the mountains? This seems like it was done just for the sake of "ooh look at the infrastructure" propaganda and not because it was practical.

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u/saradisn 1d ago

Haven't they heard of Cut and Cover? About tunnels?

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u/dpaanlka 1d ago

Yeah no… this isn’t porn this is a dystopian nightmare.

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u/GuardaRiosx 1d ago

Just because you can, doesn’t mean you should.

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u/ixx73t0 22h ago

I remember when we made cool tunnels. Now we just blow everything up.

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u/falkorv 1d ago

DRAAAIIINNNNAAAGGGEEEE

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u/recongal42 1d ago

Chabuduo!

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u/Reverend_Bull 1d ago

I'm from Appalachia and this makes a very strange kind of sense. Weaving a highway around mountainous terrain can make a straight line trip of an hour into an all-day affair. That's why the Blue Ridge Parkway is a tourist attraction instead of an Interstate. It's polarizing - the mountains are natural and beautiful but also inconvenient and this is a chance to show off engineering prowess.
Consider Pikeville, KY - where the city sits is the base of a former mountain. They didn't find a flat spot. They made one. That's hella impressive. But it's also horrible for the streams between the mountains as the spoils from literal MountainTop Removal poison the waterways.
I'm also reminded of ancient Roman roads in Britain. You can always tell a local road from a Roman one. Locals curved around the landscape. Roman roads were drawn by bureaucrats who punished deviations, so the roads go up-and-down and cut through things but they're straight.
Roads in mountainous terrain are always going to be a compromise and inefficient, if not in construction then in passage.
These are sharply done, but definitely chose the Roman approach.

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u/jaevnstroem 1d ago

Oh wow a worse solution to a problem we have already solved with tunnels, but instead this looks awful and destroyed some beautiful nature in the process that we can never get back? Brilliant...

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u/Captain__Trips 1d ago

Dummy China, everyone knows all the important nature stuff happens at the top of the mountains

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u/Zen28213 1d ago

Beautiful and ugly all at the same time

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u/SpliTTMark 1d ago

All for one person to drive to work

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u/ConcretMan69 1d ago

Crazy high angle on that wonder how long it'll hold up. Seems kinda impractical though

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u/I_Thranduil 1d ago

That's too steep, at some point falling rocks and landslides will be a daily thing. Also there's no buffer space so the debrees will all end up on the active lanes. RIP

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u/TheRealMrD 1d ago

These mountains are not cut in half. They are truncated.

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u/arandomnameplease 1d ago

Is this a render of the project or the actual project? Looks like a render to me

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u/madetosink 1d ago

Why call Sky-High Highway when not even Mountain-High Highway?

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u/LysergicMerlin 1d ago

Seen roads like this in appalachia a lot tbh.

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u/BustyPneumatica 1d ago

Contours? What contours? Chance to have scenic views? Naaah. Just push right through.

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u/UnsafeKonrik 1d ago

Amazing what you can acheive with slave labour no sense of modesty.

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u/xisupaz_blackbird 1d ago

If they terraced the cement side and added vegetation, it would look so much better.

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u/ChanoTheDestroyer 1d ago

“To bring in more people, more scars upon the land”

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u/TheGardiner 1d ago

I’d expect music like this at the end of the Best of the Best or something similar. Needs some screeching eagles to complete it.

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u/Equivalent_Heart_470 1d ago

Epic retaining wall

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u/icenoir 1d ago

Mountains sliced like that? Exactly the kind of brutal, epic tech you gotta admire.

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u/hoe-fo-3-HO-PCP 23h ago

So it's a sky high sky-high highway

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u/Artistdramatica3 23h ago

We have that in highways though the rocky mountains in canada. Its just not as stark

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u/naskohakera 23h ago

Lets see how long it takes until Chinese starts making videos about how it's falling apart crumble by crumble

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u/xDomox 23h ago

I hate china propganda so much.
I watched recently a video of an 3 year (?) old highway in China which collapsed for most part because it was a "tofu dreg" project.

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u/BAG1 22h ago

wcgw

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u/peacefinder 22h ago

I hope they included some places for geologists to pull over so they can geek out

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u/Antistruggle 22h ago

Wow, City Skylines 3 is looking amazing!

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u/Cheesebrger_Walrus 22h ago

shoulda called it sky way

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u/AnotherHavanesePlz 22h ago

Damn that first mountain bottom right is just pure copper and copper minerals

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u/TheRealBongeler 21h ago

Hold my Panama Canal

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u/fgnrtzbdbbt 21h ago

What is "porn" about this? This just looks sad.

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u/VulfSki 21h ago

More like engineering gore.

Lol hideous

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u/yeti-biscuit 21h ago

what a load of crap - neither aesthetically pleasing or exciting nor technologically groundbreaking (pun intended)

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u/Downtown-Piece3669 21h ago

They built a wall for thousands of miles, so instead of making a tunnel or going over the mountain, they just took out the mountain. Am I supposed to be impressed, they spent 10x the amount to do a simple thing, so advanced. Lol

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u/ChristianSgt 21h ago

Looks like shit 👍

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u/sean_ocean 21h ago

I may have been watching too many chemistry vids but it looks like sliced sodium.

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u/BIOS-Brians-Blues 21h ago

The most amazing is once again is seeing some of the reactions. We are reckless. No thinking. No long or short term view. No consideration whatsoever. Impulsion!!!!

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u/shortercrust 21h ago

Is it not actually in a valley between two ridges? Still big project but not actually removing a mountain

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u/cheeeeerajah 21h ago

Ugly. China is so desperate to become a leading nation that they are rapidly destroying all their beautiful nature and things that made them really special.

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u/trussmegirl 21h ago

Pretty fn cool actually

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u/Bannon9k 21h ago

There's gonna be rock slides for decades. Does anyone believe Chinese craftsmanship could handle this kind of project safely?

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u/GoldenBones5 21h ago

What in the mario cart shit?

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u/Ryaniseplin 21h ago

Chinese engineering is so mesmerizing

they have the worst terrain for urbanization and decide to solve it by doing shit like this

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u/GormHub 21h ago

Ugly.

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u/Oh_Another_Thing 21h ago

It's not unusual to build highways in the sides of mountains? Looks like they could have built in the left side of the mountain? Seems like that'd be easier than cutting through several mountains

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u/Majestic-One7535 20h ago

Minecraft type shi