Solving Traffic Conflict - Intersections and Interchanges Explained

[@teux01]

I've been playing Cities since 2016 and I never get tired of roads and traffic management in this game. It feels like an endlessly changing and chaotic challenge that you never quite manage to get perfectly right.

[@YUMBL]

The traffic makes the whole game work imo.

[@bobbodaskank]

Perfection, moving target. Can chase; cannot catch.

[@francoisgagnonlemieux3135]

I had a city of about 200k in 4 tiles and with president edition traffic manager I banned every left turn on heavy traffic arteries (4 and 6 lanes roads). Was managing 90-92% traffic flow without left turns.

[@alessiobenvenuto5159]

Well because it's almost exactly like real traffic. Finding a solution for traffic in the game would mean finding it also for the real world

[@francoisgagnonlemieux3135]

@@alessiobenvenuto5159 in all honesty we are monkeys driving so even with the perfect solution there will be traffic issues.

[@baystated]

The best part of designing intersections in CitySkylines is how obedient and patient the drivers are. No moving violations. No crashes. No road rage. And I also imagine the drivers being polite enough to thank me for my great design as they pass through. Happy Thanksgiving, YUMBLE!

[@YUMBL]

Happy Thanksgiving! :)

[@stevengalloway8052]

Well, this isn't realistic. I'm sorry, but I think we need an Accident DLC to match the realism. 😏 We would have the option to "choose" an accident on the road by clicking it on in a spot, or something. The same would be for mass transit and yes, including planes. Imagine the traffic piling up, or seeking alternative routes to go around the accident! It would be GLORIOUS! 😆😈 An plane crash could occur downtown! 😳😏 Of course it would be controversial, especially if citizens would die, but so what? We do it with the Disasters DLC. I tell you, it would be great! 😆

[@joa8593]

Isn't there actually a setting for driver aggression and law braking, or is that only with traffic manager? I agree accidents would improve the game. Many interchanges like diverging diamond and roundabouts are superior mainly because they avoid fatal accidents, not necessarily traffic flow.

[@Fieari]

@@joa8593 Only with traffic manager, and it still won't cause accidents to my knowledge, it only has some drivers exceed the speed limit.

[@markuskopter]

​@@stevengalloway8052 l'm not sure that more realism would automatically make the game better. I'm not a city planner, but I would not be surprised if most of the systems in this game were *very* unrealistic. Sometimes for performance reasons, sometimes just to ensure playability. An Accident DLC would be fine, though. Just like with Natural Disasters, if l don't want accidents in my game, l don't have to buy the DLC.

[@ilikesim1162]

Alternate British Title: The Art of turning Right.

[@darthsk8d3r]

underrated

[@JanBetonnetje1]

Lol

[@ivanaldorino]

Some country like indonesia and japan too lmao

[@JacobKinsley]

Inb4 someone posts an unprompted essay on why one is better than the other

[@5TimesWCC]

@@ivanaldorino india too

[@daviddavidson505]

From a driver's perspective, I have always loved going through a cloverleaf, especially because of the weave lane. I find that the nature of the weave forces incoming and outgoing cars to actively cooperate with each other to exchange places with each other, which makes for a very smooth transition. Contrast this with ordinary merges, and drivers already on the freeway rarely if ever accommodate new traffic from the merge lane. They can have an attitude of "it's your problem and if you run out of merge lane I don't care" with no negative consequence to themselves, whereas on a weave lane, even a selfish driver must help to create an opening if he wants to receive one. I also find that a cloverleaf's forgiveness of mistakes can be a huge stress relief on the driver. Once you get into the loops, you can completely miss your merge and all you have to do is pass around the other loops to try again. This is silly but it's a lot less silly than going five miles down the road to the next interchange because you made a whoopsie and missed an exit you didn't mean to. This can cut down on dangerous last-second lane changes as people are less desperate to avoid missing their exit when the consequence is not so harsh. It also never forces you to exit from the passing lane, which is harder to do than exiting from the non-passing lane. Getting into the passing lane can be difficult especially when contending with impatient residents of the fast lane who do not care about the fact that they are now sharing space with people who want to exit - they just want to cruise and not be impeded in any way. I don't know how any of this is represented statistically since I'm just a layman, but I suspect that the drawbacks of the cloverleaf may not bear out in practice as badly as they seem like they ought to on paper.

[@WaldoBC]

I would like to add to your point about "missing your merge...". As beutifully designed (and practically perfect & free-flowing) as the Stacked Interchange seems to be... left, right, and forward are the only options. A U-turn is impossible! Whereas, a cloverleaf allows you to essentially U-turn on the highway. It is a great option when you have missed an exit.

[@zeroibis]

"Contrast this with ordinary merges, and drivers already on the freeway rarely if ever accommodate new traffic from the merge lane. They can have an attitude of "it's your problem and if you run out of merge lane I don't care" with no negative consequence to themselves, whereas on a weave lane, even a selfish driver must help to create an opening if he wants to receive one." Ironically that is the law, merging traffic must find an opening and legally it is their problem.

[@YUMBL]

Yea, but try proceeding while someone is merging. If you hit them then… you hit them.

[@zeroibis]

@@YUMBL There is some great truck dash cam footage of cars merging onto freeways at 20mph especially in these slip lanes. The lucky ones survived to pay the ticket and the insurance bills to the trucks dash cam owner. But back on point, yea its a mess.

[@WaldoBC]

​@@zeroibis "merging traffic must find an opening..." You say this is the law. Can you find it in your traffic code? 5 to 10 times, I have scowered/scoured/searched the Motor Vehicle Act (MVA) of my province of British Columbia and I can't find any definitive wording on this subject. Can you show me where it says it "in law" in your state (or where ever you are from)?

[@jeffjeff376]

Good stuff. I think what was left unaddressed was how to classify and solve the problem you initially presented, a high traffic urban intersection of two non-highway arterials? Perhaps a bypass roundabout? The tail on the turbo roundabout's traffic seemed to be primarily from cars wanting to go straight through. I always end up making a spaghetti stack in those situations, and hiding it underground in shame.

[@YUMBL]

With good road hierarchy and attention to connections combined with transit your arterial and collectors intersections should do alright. If its a highways worth pf traffic then vanilla overpass would work wonders.

[@medviation]

My personal favorite: the cloverstack hybrid. It eliminates a clover's weaving, but cheaper than a full stack. Also, try using cloverleafs with collector lanes to eliminate weaving. Dual trumpet interchanges are also useful if your roads are tolled.

[@YUMBL]

Love a cloverstack. I have a vid on that too :)

[@moekitsune]

Just yesterday I was trying to find videos about this, great timing!

[@YUMBL]

Thanks for watching! :)

[@FlorianHofmann]

Your videos are very enjoyable ... like the Bob Ross of City: Skylines intersections :-) One thing I noticed in several of your videos: if you have a intersection with a traffic light like you have in the beginning of this video, you could force the cars going straight or right into the left two lanes and then allow right turns on all stopped sides.

[@YUMBL]

Thank you!

[@JobaerArman]

We love hearing your detailed explanation and everytime we get learn something about roads and intersections. You wouldn't belive but this topic is very exciting to me. Thank you for your great content. Keep it coming...

[@YUMBL]

Thank you! :)

[@mrxmry3264]

3:38 that is the simplest type of cloverleaf, and yes, the weave is a problem because it happens right on the main carriageway. the first step to solving the problem is to move the weave away from the main carriageway by splitting the highway into 2 separate, parallel carriageways and then connecting the slip roads to that secondary carriageway. there are many such cloverleaf interchanges in germany, traffic can flow freely on the main carriageway while the weave happens on the secondary carriageway the next step is to eliminate the need for the weave by switching the order of the lanes leading into the secondary carriageway. so when a car comes off the northbound highway onto the secondary carriageway, it finds itself on the right lane of that secondary carriageway instead of the left lane, so no lane change is required. problem eliminated. one example of such an optimized cloverleaf can be found in frankfurt, germany, right next to the airport, where the A3 and the A5 meet. that one is made slightly more complicated by the fact that another junction (A5 and B43) is very close. but you can clearly see that the lanes cross over each other in every leaf. and why the hell can't i post links to google maps???

[@JuddMan03]

i love how tidy those lane markings on the roundabout look

[@Terrabyte20]

It's always fascinating to hear someone talk about things their passionate about when it's a topic most people would take for granted.

[@YUMBL]

My family even liked this one 😂

[@Ian-uu7st]

I wished you talked about the interchange in your thumbnail :( This video was still very interesting and inspiring

[@YUMBL]

Oh, that is a butterfly. Its a weave machine 😅

[@nibordu99]

Guy, since I discover your channel, I can't resist to watch new of your videos. You're really interesting and this way you have to explain it's just absolutely awesome. It's very inspiring and improve thinking about traffic management. Love from Belgium man, keep it up !

[@YUMBL]

Thank you very much!

[@gen2ssi396]

Thanks for the knowledge about the interchange. I now have some understanding of what the traffic is all about.

[@iboKirby]

That’s so interesting learning about those system interchanges. I know about cloverleafs before, but not what stack interchanges were. Here in Fargo, there is an interesting interchange between i94 and i29 that is a partial cloverleaf and partial stack. Three directions are cloverleafs and one is a stack. I found it really interesting.

[@YUMBL]

Ah, a cloverstack! I have a video about those as well :)

[@misterjt961]

ive gotten pretty liberal with the modding of a stack interchange in one of my cities. used Move-it and Node controller to make the whole interchange be about 50% wider than just two highways passing over each other. looks really cool in a downtown environment.

[@deanonesense]

Mound and I696 in Warren Michigan (just north of Detroit), a slightly contorted stack as a service interchange. I want to say we have a couple of full cloverleafs connecting stroads. We also have stacks were the lefts leave from the left and join from the left, M10 and I94 in Detroit. Quite a few of those also, but I think those are all system interchanges.

[@christopheralvarez6230]

This channel really deserves way more subscribers. Top notch!

[@YUMBL]

Much appreciated :)

[@Pzdrs]

i feel like a nerd excitingly watching this and I love it

[@Wemdiculous]

The art of turning left is a dark art. Build your grids in hexagons so people can only go “straight” or “right”. Then build subways that take people “left”. These directions don’t exist on a hex grid… but there is a direction that traffic flows easily. And a direction where traffic has to drive further to get to their destination. Make subways that flow along the direction where traffic would have to drive further. Then add some cargo rail in the same direction. Or maybe just separate homes and industry along that direction so trucks are disincentivized in driving through residential.

[@VestedUTuber]

YUMBLtv: "Roundabouts aren't always the solution." Biffa: "And I took offense to that." Anyway, finally, a C:S KZbinr who doesn't worship roundabouts as some sort of ultimate traffic panacea.

[@YUMBL]

;)

[@PhattyMcdugen]

Have gotten a chance to watch yet, but saw that you updated and wanted to be sure to comment to satisfy the algorithm. Happy Thanksgiving. I'll let it play in the back ground.👍

[@YUMBL]

Happy Thanksgiving! :)

[@MaxFX1984]

My personal totally unbiased opinion: Best video yet!! That Stack Interchange looks very cool! Keep it up!! -MaxFX

[@YUMBL]

Thanks for making the good ones! Did you see the weave machine thumbnail! 😂

[@MaxFX1984]

@@YUMBL Yep, saw the thumb. Honored. Did you give the suggestion about the Pinwheel a try? Really wonder what you think about it, and how you can use it.

[@YUMBL]

I forget what you suggested 😅

[@jefffinkbonner9551]

I love the pleasant curves and design of that stack. It even traces an Iron Cross, a common symbol of Germany, historically. One thing that irks me a bit in City Skylines is how one can get away with completely unrealistic interchanges with short, sudden ramps that look hideous. The standard cloverleaf shown here is unfortunately an example with how sharply the loops bash into the mainlines. It’s like the final 20% or so of each loop needs to be completed. But this is an excellent video! Loved that super turbo roundabout with the protected right turns-prevents so much weaving.

[@MaxFX1984]

@@YUMBL About adding straight pieces between the bends, creating a 'one-way city block' as you called it.

[@clnetrooper]

For getting off the highway, the parclo and dumbell are my go to if i got the place to use them and need to use both ways (dumbell for easy to build and quick to set up and parclo if i need to handle more traffic). They also look really nice when you look at them visually. But if i need to be really compact and i don't have much place, i'll use a three level roundabout. That thing can handle a lot of traffic (with slip lanes and all) and be really compact.

[@EnzoVinZ]

My personal favorite is the single-point. I used that whenever I can because it's compact and looks good.

[@YUMBL]

SPUI is a mainstay for me :)

[@EnzoVinZ]

@@YUMBL Yeah, I saw that in your video. Thank you.

[@u9477]

You shouldve mentioned that you can combine intersections and roundabouts. Dumbbell intersections look pretty cool, they are easy to use and efficient, both ingame and irl. I know of one that is somewhat local to me (40 mins away). Its a nice change from all the regular intersections and interchanges.

[@YUMBL]

I did say you can change the ends of a parclo into roundabouts, but its ok. This wasn’t a video about every junction

[@haseebjaspal90]

I think a combination of the partial cloverleaf and over/underpass for through traffic will prove to be more efficient. I use such combinations often and have over 89% traffic flow in a city of over 250k.

[@PhattyMcdugen]

I appreciate your take on roundabouts. They are useful, but are by no means a magic bullet.

[@YUMBL]

People often don’t like to hear it, but this is certainly the case

[@yeeeehaaawbuddy]

The best thing to do in Cities Skylines is to make the entire road system, actually just one, one-way road. Just one huge snake through the landscape. Sure, it'd suck to ACTUALLY have a real road like this, but the sims don't care. I like to think of them as always sight-seeing. "Here we go kids, thru the industrial part of town, on the way to school..." jk

[@PianoKwanMan]

Even the dirt road is good for everything, apart from emergency vehicles. There's no hierachy.

[@lucascaton9428]

My favourite intersection is definitely the cloverstack, best of both worlds!

[@rhodridavies9426]

In the UK, from my experience, the primary junction/interchange used is a grade separated roundabout, though there is a great example of the stack junction you mentioned just outside Bristol where the M4 and M5 converge, it's honestly quite beautiful looking at it on google maps! :-P If you wanted to see the most insane junction in the UK though, it's the A38(M) joining the M6; Gravely Hill junction, also known as Spaghetti Junction! You could say, this is what happens when stacks go mad! :-P

[@MrGhostly12321]

Been looking at Google maps a lot recently for inspiration for this game, and looking along the east coast of America I see a lot of these absolutely enormous, spaghetti like monstrosities right in the city centers, I was wondering if you could maybe do a video covering these? Maybe going over the design principles and history behind why they're like this,, because they seem to exist counter to what you've described here regarding service interchanges. Thank you :)

[@bootsmcbobble1886]

Us kiwis have perfected the art of turning left! We hardly ever cross traffic when turning left in New Zealand....

[@YUMBL]

😂

[@albatrosparra5831]

Cool video, but I think that by creating a diverse system of transportation (bus, metro, tram, etc.) will lower the traffic volume way much more effectively than an urban highway, but still cool video

[@YUMBL]

I don’t recommend urban highway, and didn’t here. Always use service interchanges to bring traffic into the city.

[@chaoswarriorbr]

Always, if they're properly planned for distance and future proof for demand. This is valid in game and IRL. Some places have even put some modern trams or light trains, but didn't consider the stations and where the track passes, negating any major improvement in non-individual transportation system, plus the security issues...cough...cough...LA...craptastic urban planning. It's always a balance between where you create what type of demand and how to fulfill it. Longer distances, like cross town and suburbs, you need a express train. Mid distances, standard metro, high volume inner city. Mid to low, trams/light trains. Low volume or short distances, busses galore or trams in major collectors.

[@scottanderson8167]

I’m surprised you didn’t pitch your SPUI service interchange, which is my go-to for all service exists. It’s infinity good.

[@YUMBL]

Oh, I did! When the parclo was on screen :)

[@scottanderson8167]

@@YUMBL awesome job.

[@brickisland6353]

In the end it all comes down to the space you got and how much traffic you anticipate will be using the said road/intersection.

[@jefffinkbonner9551]

5:50 The traffic light settings on the ParClo can be adjusted such that the surface road traffic coming off the overpass in each respective direction never has to stop. The ramps allowing a right turn off the highway can likewise flow freely if they get an additional lane on the surface street. If each onramp has two lanes initially, the right turn onto the highway can flow freely as well. The only stops are the surface street as it approaches the interchange from the outside ->

[@YUMBL]

Yep. I have a video about parclos that explores lane math and traffic lights. Feel free to check it out!

[@Wemdiculous]

Take your biggest most traffic intense road and build a bridge so the right side of the road can be on the left side. Take it around the outside of your city. Do the mirror of that on as the road exits you city and run that incoming road around the other side of your city… Now you have the worlds largest double diamond interchange, a very low conflict exchange. It also may look like an inverted roundabout to some. But whatever you call it, it solves many traffic problems cheaply.

[@c0ldc0ne]

Learned about innerchanges on the innernet.

[@CarlosCarucce]

Learning a lot from your videos. Thank you

[@YUMBL]

You’re welcome!

[@MaxDriftS13]

Always loved the parclo since you inspired me to start using them awhile back but pretty sure your lights can be set up better

[@YUMBL]

Thank you! It was a quick setup for the video :)

[@ajbroaj2881]

I quite like the 3 layer roundabout for my interchanges personality although I have to try out that b4 clover

[@joshi3x]

In your first example right turn traffic should have a green light at all times. Since straight through traffic is only two lanes and leaving streets have three lanes and right turn traffic does not conflict with any other traffic. Further optimization would be left turns with two lanes.

[@enfynet]

My favorite CS vanilla highway interchange is the windmill. Playing on console some of the more elaborate things are harder to do.

[@YUMBL]

A great choice for a system interchange :)

[@ttwilight_dragon]

I would say i don't know why that appeared in my recommendations, but i can imagine (Thank you, motoway Matt kkkkk). But great video anyway. Super interesting

[@YUMBL]

Thank you :)

[@WickedV3ng3nc3]

I really learn from this, great work thank you.

[@YUMBL]

You’re welcome! :)

[@ouzoloves]

I do feel like the roundabout could still improve matters if it is built larger. The benefit of a roundabout is it increases the number of vehicles passing through the intersection at the same time, but the relatively small roundabout you had, would probably only handle arterial road traffic. Obviously you don't want to stick a roundabout on a highway though. Common design in the UK as you probably know is to have a roundabout above the highway and have slip roads leading to/from the roundabout to the highway and connect your arterial roads to the roundabout as well.

[@YUMBL]

Yes. Lights are better on arterials. Lots of people seem to want to save face on behalf of the roundabout and alter it to improve it, but when hit with traffic on all sides (as on an arterial) a light is much better.

[@e5b7-wr811ouhih]

This channel has convinced me that roundabout aren’t that great.

[@YUMBL]

They are, but only in the right place. They cannot do it all.

[@TheJerseyNinja]

Did you study civil engineering? Or did you just do a lot of research? As a civil engineer myself, your explanations are very good.

[@TheJerseyNinja]

Also personally I’m a fan of diverging diamonds in high traffic areas where you don’t have a slot of space for high speed entrances and exists such as a busy area under the major highway. We’ve implemented a few of them and you can make them pretty small and it helps traffic a lot. The only thing I’m not a fan of is how confusing it is for people the first few times

[@YUMBL]

Just an avid cities skylines player who found his way into the engineering videos. Thank you very much :)

[@JKTCGMV13]

Good distinction to point out :)

[@YUMBL]

Thank you :)

[@deViant14]

I was just thinking I haven't felt personally attacked about roundabouts yet at the beginning of the video but it was just a premonition.

[@YUMBL]

Sorry. I wish they worked as well as people think they do in heavy traffic.

[@ThePancakee]

CAN YOU PLEASE DO A VIDEO ON THE MID-HUDSON BRIDGE IN POUGHKEEPSIE NY!!!!! Its a 1 of a kind intersection that they are asking nation to help fix

[@the.skirmisher]

Awesome stuff. I love your videos.

[@YUMBL]

Thanks for watching!

[@IamTheHolypumpkin]

We have only a single stack interchange in all of Germany, despite being known for our Autobahns. And it a rather useless Stack interchange. It connects Autobahn A45 with Autobahn A480 but A480 is just 3.6 km (2.2 mi) long. While a 2km (1.5 mi) extention to the south is considered. As a replacement, because the city where the stack is located is considering to demolish an elevated through road through the city, but the extention to the north is canceled. It's basically a stack for an service interchange, at the moment and for the foreseeable future.

[@Evilducky200]

I love your videos. at 2:46, the car random on the one side changes color lol

[@YUMBL]

Thanks! Its the distance level of detail.

[@Evilducky200]

@@YUMBL I though it was running from the police, but we will go with your answer as well ;)

[@devvydoesstuff]

2:38 they can still turn left and right they will just have some “minor” damage afterwards

[@stephenspackman5573]

Can you not apply grade separation to the turbo roundabout plan to get something both compact and free flowing (albeit with sharp turns)? The idea would be that the roads would both be 3:3, the E-W arm would see inbound lanes 1 & 2 (of 3) elevated a little less than a full level (say 6-8m) on the approach, and the N-S arm would see inbound lanes 1 & 2 similarly depressed. You've got a half rotation of the ‘roundabout’ for each of these to return to grade, which should suffice.

[@Bland-79]

Diverging Diamond Interchanges are the best. No left turns into crossstraffic anywhere which reduces crashes.

[@YUMBL]

DDI is a great option. Its not ideal everywhere, but its a great upgrade from a diamond.

[@Bland-79]

@@YUMBL Springfield Missouri near where I live upgraded alost all there intersections around the edge of the coty to these

[@amherstburgerpicker5786]

Great video @yumbltv !!! Excellent explanations as always. Did you hear @city planner plays gave you a shoutout on his video he named the University in his beginner build tutorial yumbltv University.

[@YUMBL]

Oh, thank you! People have told me that he mentioned my name, but not that he named the school after me. Thanks for the heads up! :)

[@TheSoundkite]

Hello Skyliners. Im fairly new to the game, no need to say, i love it. Yumbl, u have all my respect for all the afford u put into all of us. When i started, i got all the mods and assetsxand everything i could put my hand on....failure...then i found u and the mods u use, it took me a day to solve the big bang theory, voila, the game runs as smooth as i never thought it would. Thanx. Okay, enough of s..king up soo deep.. About left turns. May i ask u to have a tutorial of these left turns from arterial to collector to even smaller roads, since i get stacked within the city, not on interchanges. Yes, i learned the use of timed traffic lights, still, unbearable...funny. I also have a system i would want to try, and i would ask u to take a look and if possible, rate it. Im from Budapest, Hungary, and within the city, there are no left turns. The only way u can turn left, if u drive a block further than the intended left turn, and every road on the right are one way roads, so u do three right turns, end up at the intersection where u intended to turn left, and u drive straight at the traffic lights. There u go, the left turn made in a circle. Im sure it is confusing, but i hope u'll figure it out. Thanx for reading all my lifestory. :)

[@YUMBL]

Welcome in! Feel free to post your idea in the discord

[@TheSoundkite]

@@YUMBL u think i know how to use discord? Im about to be 50yo...but dont tell anyone pls..

[@YUMBL]

I also have twitter and instagram. I simply cant interpret the words into results. I’d require a visual, and youtube tends to block links

[@D.Trinchuk]

On the roundabout it was clear, that only moving forward vehicles were stacked, even the ones who turn left were ok. So I wonder, what if you tried the roundabout with forward overpass, that you demonstrated a while ago? Doing the overpass even just for one road would drastically reduce the amount of cars on the roundabout and might even help to clear the other road.

[@YUMBL]

That would work great, but the light kept up without needing to be converted to an interchange ;)

[@Blade-hf9po]

I prefer the diverging windmill interchange. Sure the standard one merges on the left, but you can choose where, to minimize conflict.

[@saschab.5154]

Thanks for talking about interchanges. Would love to have an asset list link from you.

[@YUMBL]

In the description :)

[@VlerkeDamne]

Hi I'm new to your channel and just wondered what your background is on this topic? Learned by experience from the game or do you apply knowledge from university/school? Just asking, I study architecture and this is something we have to learn as well, very interesting, useful -and above all - correct information!

[@YUMBL]

It all stems from the game for me, but its a simulation. I get to see the results of different designs. Plus living on rt66 in the US. I get to see traffic management at work.

[@VlerkeDamne]

@@YUMBL Keep up the good work you earned a sub. Traffic in this game is so addicting

[@YUMBL]

Thank you :)

[@bazzakrak]

So Biffa is the round-a-bout person, CityPlanner is the waterpipe person guessing you will soon be known as the interchange person :D

[@YUMBL]

I’ll absolutely take it

[@enzmondo]

This video will cheer Derek Zoolander up.

[@berenscott8999]

What about the following intersection. The left and the right side of the road are grade separated. Ramps occurring on both sides. I think a missed opportunity is that one side of the road never has any form of connection.

[@marcelo55869]

Architects & engineers: ~years of study on traffic and cities.~ Dubai politicians: "Yeah I would like a grid layout please...."

[@diezel5267]

Next you should show the Jersey Jughandle. The Jersey left! All Turns From Right Lane.

[@kasuha]

The flaw with the roundabout at 1:24 is that you have single lane for each direction. Notice only middle lane on each entry is congested. The fact that the left lane is not means you have way more traffic going straight than turning left, yet you have only one lane for each. I'd say, allowing the left two lanes to weave both on entry and on the roundabout should increase its traffic throughput because traffic now centered on the middle line will spread over two lanes. Now, of course a roundabout with cars crossing will slow the traffic down compared to the further designs. But it doesn't have to be as bad as in your example.

[@YUMBL]

I upped the capacity as an experiment due to another comment. Created an extra turn lane. Two lanes entering in all sides. Same result. I would invite you to experiment, but a light is better on an arterial road.

[@YUMBL]

I then re replaced the roundabout with a light and the traffic reduced back to steady levels. I’m sorry you dont like it, but thats how it works.

[@cm24624]

I really like a 3-level stack DDI, it has no lights and is about the same size - except for one extended bridge. Though you do end up with two weaves.

[@YUMBL]

Ive heard it called a DCMI. That would be a system interchange

[@spungejonny]

Would like to see how you could recreate gravelly hill interchange aka spaghetti junction

[@donvito7103]

Cloverleaf is simply the best. You can always get on your route by turning right until you drive on the lane you wanted.

[@donvito7103]

Even if you want to make a U-turn

[@rbursell1]

New video yay 😄

[@fermitupoupon1754]

Looking at the roundabout, it looks to me like you've cut the straight through traffic down to a single lane, where the other intersections always had at least 2 lanes of straight through traffic. I think it'd flow better if it had 3 lanes going into the roundabout with the outermost lane serving both 1st and 2nd exit, and the right turn slip road being split off earlier along the feed road. Or if the amount of traffic that wants to turn left is relatively small, use the innermost lane of the feed road to also serve straight through traffic and have 3 lanes on the exit roads as well.

[@YUMBL]

You should try it, but I have yet to see a modern roundabout that beats a light at high density traffic.

[@fermitupoupon1754]

@@YUMBL Which is odd in my experience, because when comparing Takenhofplein and Nelson Mandelaplein in Nijmegen (both are part of the S103), Takenhofplein is the more efficient intersection of the two. So the roundabout wins out over the large lights controlled intersection. But I suppose that it also has a lot to do with the AI of the traffic. That AI clearly wasn't designed with roundabouts in mind. Though I don't really mind that, the entire game is about building a North American style city, so it makes sense that traffic would behave like North American traffic.

[@YUMBL]

No, i mean a roundabout breaks down mathematically when hit with too much traffic. In the real world. Lights hold up at much higher volumes. It has nothing to do with countries.

[@achillesa5894]

Nice video as always, may I ask how do you test these? I'd like to stress test some of my own setups.

[@YUMBL]

Thanks! There is an interchange test map that I used. From the steam workshop.

[@thatsnailguy]

I want to see you tackle a double crossover merging interchange (DCMI)

[@YUMBL]

Could be fun :)

[@Nezodam]

I'm never making a right turn ever again! On your left!

[@AISPs]

1:52 I definitely don't agree roundabouts can solve everything, and here's a good example

[@YUMBL]

Show me! I thought a roundabout would be better here, but it simply was not

[@cheryldahl9192]

How do you get the lights to work like that? In my game, the lights make two opposing sides go at the same time, so the traffic clogs up with people trying to turn, and others trying to go straight through.

[@YUMBL]

Did you get traffic manager?

[@sergiumecheres]

2:00 those are sunday drivers. Why would they wait so far from the roundabout ?

[@Hugh.Manatee]

Now I kind of want to build the city the comment section deserves; one where every 4 way intersection is a stack interchange. An American style grid with nothing but stacks.

[@YUMBL]

I might advise against it, but would also like to see it

[@ClarinoI]

Does anyone use this game using actual city layouts and traffic patterns to see how they might improve traffic flows IRL?

[@lifted2575]

Happy thanksgiving Yumbl

[@YUMBL]

Happy Thanksgiving!

[@pentafe]

On one of the main highways from one city to another in my country we have the clover intersection. It looks to have been designed in 1970s, just like pretty much all of Poland and it now supports 2021 traffic. The amount of space for weave is very little and combined with the speeds of 80-120kmh, makes this stupid ass intersection my most hated in real life.

[@YUMBL]

If a cloverleaf backs up its hell. Its fine until that point, but extra bad if overwhelmed.

[@pentafe]

@@YUMBL thankfully I've never experienced an actual traffic jam there and not a single accident, which is frankly surprising! I have also checked the length of the additional lane used for merging, it is 105m, while the speed limit on the highway is 140kmh and on the other "express" road it is 120kmh.

[@YUMBL]

Sounds unsafe

[@Vengir]

​@@YUMBL It must have been an old road. Current regulations state that for 120 and 140 km/h roads the merging lane must be have a shared edge of at least 250m (and that excludes the additional wedge at the end where the lane narrows and disappears). 140km/h roads cannot have weave lanes, unless they are separated from the main through traffic (they unmerge and merge with it some distance from the interchange itself). The weave area must be between 150 and 300 meters, "depending on the conditions" (so for 120 km/h speed limit, I would expect it to be closer to the upper limit, if it isn't separated from the main through traffic anyway, like it has to be on 140 km/h roads).

[@migueldamore2535]

How to do asymmetrical roads? And how can I put 2 or more than 3 lanes in highways?

[@YUMBL]

The mass transit DLC has them all.

[@VELIkiq8]

How about the single point partial cloverleaf you showed

[@YUMBL]

It’s better than the parclo, though much bigger and a bit harder to build

[@csm2455]

You’ve deleted an input and output lane for each arm of the roundabout in comparison to your original four way intersection, that would be the reason you have such big tailbacks!

[@YUMBL]

We’ll find out in the next video ;)

[@ryohandoko1450]

04:42 How do you place that interchange without some road textures disappearing?

[@YUMBL]

It just worked. Do you have all the dependancies?

[@TheUntamedNetwork]

As you have said in one of your other videos, if all the traffic is built up in 1 lane, you've allocated your lanes incorrectly.

[@YUMBL]

Yes. I wouldnt allocate any lanes into a roundabout with this volume of traffic. A light is the way to go

[@WaldoBC]

What if the B4 (before) ParClo had roundabouts instead of lights at each end?

[@YUMBL]

That would probably work!

[@TheShamarski]

I see that you like the B4 Parclo. Why not use an A4 parclo? I'm curious

[@YUMBL]

B4 favors the highway traffic. A4 favors the arterial. If road hierarchy is correct the B4 is generally better.

[@TheShamarski]

@@YUMBL I see. Interesting. My question stems from so many A4s being used predominantly in the real world. I'll try using some B4s in my playthroughs of C:S. See how they work out! Thanks for the reply

[@YUMBL]

You’re welcome! A4s require highway traffic to wait, and B4s let them flow freely. Thats all. :)

[@ardemus]

While you may be right, it doesn't seem fair to compare throughput between options that don't use the same number of lanes to feed in and flow out of the crossing.

[@YUMBL]

When comparing a series of junctions the people who love the roundabout the most seem to wish I didnt include it.

[@abhinavbanerjee9649]

@3:55 the truck literally drove over the motorcycle on the North to South Flank.

[@rmlmariano]

Hey yumble what 3x3 road mod are you using for parclo that has the road island? cant find it :/

[@YUMBL]

Give me a timestamp!

[@rmlmariano]

@@YUMBL Its on the Parclo timestamp. Im refering to the 6lane arterial. idk why I called it 3x3 lol. Thankssss 😁 🙏

[@YUMBL]

Probably part of the “ultimate american roads” pack

[@bumpwavy]

how would a design where cars can only turn right BUT you have U turns so they can tecnically turn left?

[@bumpwavy]

i would also do the U turns from the right with a bridge so that traffic that integrates from the right can turn left without having to cross all the lanes. it would be a right to right lifted u turn

[@YUMBL]

See my U turns video.

[@Decoda3D]

How do u get you're roads to be black ? Mine are always grey and can't find the road on steam 😒

[@YUMBL]

I have a video called “dark roads” that explains it

[@jamessotelo]

I can’t find the exact 3x4 road used on this tutorial.

[@YUMBL]

Its in the “ultimate” us roads pack

[@jamessotelo]

Thank you.

[@paulferry7791]

What if the roundabout was not half a city block in diameter but rather two to three (maybe even four) city blocks in diameter?

[@YUMBL]

Still can’t clear the traffic on this map, though people have tried.