My interchange designs.

mysterious

I will use this thread, to put up various interchanges I've re-designed/modified here.


At the mo.
I'm redesigning the N25/N8 interchange (I'll put up shortly).:)

I will put up the Newlands cross upgrade on up soon here.

If you see an interchange that you would like me to try redesign give me an example and I'll put my drawings on there.


All the best.

Road-Hog

Really looking forward to this, will you be including vertical and horizontal alignment and taking into account drainage, environmental, ecological and CPO issues? I take it you must be either a student or a public servant given the time you appear to have on your hands to be doing this sort of stuff.

nordydan

You get some unjustified stick on here Mysterious, don't listen to the begrudgers. They who have no ideas of their own.

What would you do with the N4/R290 to N4/N17 section of the N4 for a start?? A parallel D3AP section for tractors is required, as well as freeflow movements between N4 and N17

I'd then be interested in future junctions of the proposed DOOR.
Cheers

Delta Kilo

Interesting thread I must say.
+1 on nordydan's comment about the unjustified stick.
Wasn't it on this forum where a guy put up his design for the west tie in where the Athlone dual-carriage way ties into the M6 and low and behold a week later the official design was changed to exactly that!

Although, nordydan is probably a road engineer shilling for some lad to do some free design work for him :pac:

kaizersoze

Delta Kilo wrote: »

Interesting thread I must say.
+1 on nordydan's comment about the unjustified stick.
Wasn't it on this forum where a guy put up his design for the west tie in where the Athlone dual-carriage way ties into the M6 and low and behold a week later the official design was changed to exactly that!

Although, nordydan is probably a road engineer shilling for some lad to do some free design work for him :pac:

I think you mean the temp diversion route while the tie in was being done where dolanbaker suggested removing the concrete barrier and letting the eastbound traffic cross the westbound carriageway.

If it's the actual tie in you mean then there was only one way it could have been done...unless the CPO'd Elan.:) A good sheep dog could have designed it.:p

mysterious

Road-Hog wrote: »

Really looking forward to this, will you be including vertical and horizontal alignment and taking into account drainage, environmental, ecological and CPO issues? I take it you must be either a student or a public servant given the time you appear to have on your hands to be doing this sort of stuff.

I'd like to see you put as much effort as I do put into it.

I never claimed to be a road engineer. I don't have great equipment to design the interchanges that I have done so far.

Maybe next time before you post a dig, Offer some of your designs.:D\

Delta Kilo

Delta Kilo wrote: »

Wasn't it on this forum where a guy put up his design for the west tie in where the Athlone dual-carriage way ties into the M6 and low and behold a week later the official design was changed to exactly that!

kaizersoze wrote: »

I think you mean the temp diversion route while the tie in was being done where dolanbaker suggested removing the concrete barrier and letting the eastbound traffic cross the westbound carriageway.

I'd like to think that I pre-empted their temporary solution, rather than they copied it. I hope it was just the press reports a few weeks earlier were incorrect!

Irjudge1

Road-Hog wrote: »

Really looking forward to this, will you be including vertical and horizontal alignment and taking into account drainage, environmental, ecological and CPO issues? I take it you must be either a student or a public servant given the time you appear to have on your hands to be doing this sort of stuff.

I can understand where Road Hog is coming from if the redesigned junctions are going to be compared to existing design solutions without acknowledging that there may be issues to be considered than purely just the geometrics.

Road-Hog appears to think that you're wasting your time, I don't, I think its a great idea and i look forward to seeing your proposals OP.

It would be a real challange to design the ideal junction in many sites without being able to flatten nearby buildings, the M50-N3 being a classic example.

Be interesting to see what comes out of this.

Amtmann

Road Hog, would it be too much to ask that you declare your professional interest in this?
Mysterious can be an incredibly annoying poster. But at least he recognises the inadequacies of some currently under-construction interchange designs. For all their education and expertise, professional civil engineers made a royal balls of Dunkettle, and it looks like the same will happen now at the N25/M9/N24 interchange. You don't need an MA in engineering to see that.

Chris_533976

Turnpike too, given how recent that is.

Sponge Bob

I haven't a clue about junction design, look what I came up with when I tried

https://www.youtube.com/watch?v=6k4IL2Z-aWU

Can you beat this!

Can you imagine if this was in Dublin. :eek: Walkinstown perhaps :pac:



Or this one in Colchester!

Road-Hog

Furet wrote: »

Road Hog, would it be too much to ask that you declare your professional interest in this?
Mysterious can be an incredibly annoying poster. But at least he recognises the inadequacies of some currently under-construction interchange designs. For all their education and expertise, professional civil engineers made a royal balls of Dunkettle, and it looks like the same will happen now at the N25/M9/N24 interchange. You don't need an MA in engineering to see that.

None other than I live in the general south east area, I would acknowlege that the M9/N25 may not be ideal but I think it will be along time before the traffic volumes merit a Red Cow type upgrade

johnbk

What would the capacity of the the N24-M9 roundabout be?

On the old Granny junction traffic coming from Limerick on the N24 seemed to be worst hit at peak times as they had to yield to Waterford City - N9 movements.

Will this be much better on the new N24-M9 roudabout?

Road-Hog

johnbk wrote: »

What would the capacity of the the N24-M9 roundabout be?

On the old Granny junction traffic coming from Limerick on the N24 seemed to be worst hit at peak times as they had to yield to Waterford City - N9 movements.

Will this be much better on the new N24-M9 roudabout?

Taking into account that the fromer roundabout was of the miniscule type with only single lane entry and exits and that the new one(s) will have dual lanes on entry and exits, there should be a significant queue reduction.

Tech3

Deleted User wrote: »

Can you beat this!

Can you imagine if this was in Dublin. :eek: Walkinstown perhaps :pac:

The magic roundabout isint a patch on the Arc d'triomphe one in Paris :pac:

https://www.youtube.com/watch?v=K9C6CGADbjU

Look on youtube for Vietnam or India for some really scary junctions!

mysterious

Here is a Map of existing Dunkettle








Here is my first one. The N25 free flow layout.


This is the best I can do With MS paint.:) If I had better tools it would be much easier.

• 3 extra bridges
• And Mainline N25 widened to facilitate merging movements.
• All movements are free flow.
• Existing roundabouts underpasses used
• Inexpensive and efficient layout.

These are not professional drawings. I cannot work out the exact measurement and aspect to scale using the tools that I have.

D.L.R.

You can do much cleaner work with MS paint, use the curve tool and plot your lines first. Its too messy to read properly. Or download illustrator.

Typewriter

mysterious wrote: »

Here is my first one. The N25 free flow layout.

I'm confused where exactly is this? Is this Dunkettle? If it is which road is which and where is the tunnel?

mysterious

green_jesus wrote: »

I'm confused where exactly is this? Is this Dunkettle? If it is which road is which and where is the tunnel?

Yes it is,

The Tunnel is South
The N25 is east
The N8 (city is west)
The N8 Dublin (is north)

mysterious

D.L.R. wrote: »

You can do much cleaner work with MS paint, use the curve tool and plot your lines first. Its too messy to read properly. Or download illustrator.

I like to see you try.

It not as easy to use the curve tool as one would think.
There is nothing messy about my design. It's your eyes thats the problem. Not the layout.

Typewriter

I think you mean the city is east and n25 is west if the tunnel is north?

Very impressive but that looks as if it might be a bit of a steep decent into the tunnel.

For those of us who don't know the junctions, it may be useful to put the "before" image up as well.

mysterious

green_jesus wrote: »

I think you mean the city is east and n25 is west if the tunnel is north?

Very impressive but that looks as if it might be a bit of a steep decent into the tunnel.

The tunnel is south on that pic.:)


Seriously I know where North and south is on the map.

murphaph

mysterious wrote: »

I like to see you try.

It not as easy to use the curve tool as one would think.
There is nothing messy about my design. It's your eyes thats the problem. Not the layout.

The guy was trying to help you.

murphaph

mysterious wrote: »

Yes it is,

The Tunnel is NorthThe N25 is east
The N8 (city is west)
The N8 Dublin (is south)

then when questioned...

mysterious wrote:

The tunnel is south on that pic.


Seriously I know where North and south is on the map.

Your original caption does NOT make sense. If the tunnel entrance is NORTH on your layout then the N8 to Cork MUST be EAST! I know you like to think you are always right but you can't reverse the poles.

mysterious

That was a mix up. I know the tunnel is south. Its facing The Cork Harbour. So I admit error.

Typewriter

D.L.R.

mysterious wrote:

I like to see you try.

It not as easy to use the curve tool as one would think.
There is nothing messy about my design. It's your eyes thats the problem. Not the layout.

Easy fella I'm not knocking the effort. I like the idea you just need to present it more clearly.

nordydan

This is an awful load of bollocks of a drawing, but what about a design similar to this? It keeps the M8 and M/N25 continuous, as that's what they're supposed to be

mysterious

nordydan wrote: »

This is an awful load of bollocks of a drawing, but what about a design similar to this? It keeps the M8 and M/N25 continuous, as that's what they're supposed to be

I would prefer that design myself.

I made my designs on whats currently acheievable.


You would have to removed the whole interchange and start from scratch. You have quite alot of bridges there. It would be a lot of work.

I think its good though. I would prefer the N25 mainline.

Chris_533976

Tunnel north to N25 east should be the mainline.

I drew a version of this myself a few years ago that had all movements resonably easily, including the stupid Little Island road. Unfortunately its easy to do if you have one set of traffic lights.

I reckon they'll have to put in a parallel road from the little island road on the south of Dunkettle to a massively upgraded Little Island junction, upgrade Dunkettle and fix up the Glanmire interchange all at once.

The Word Is Bor

Vertical alignment from tunnel to N8/M8 would not be achievable.

mysterious

The Word Is Bor wrote: »

Vertical alignment from tunnel to N8/M8 would not be achievable.

How not?

Chris_533976

One problem is that if you GSJ Dunkettle, then the Glanmire junction is right on top of the slips. You can save that problem with some slip roads.

This may have some unnaturally tight slips, and upgrading the Little Island junction is a pain in the ass, but overall (I think) this has most movements that matter freeflow.

Anyone spot any I left out?

mysterious

Chris that would not work at all.

Far to many flyover all over the place that have no coherent direction whatsoever.

mysterious

I can count at least 15 flyovers on your drawing.

L1011

mysterious wrote: »

Chris that would not work at all.

Far to many flyover all over the place that have no coherent direction whatsoever.

It appears, however, to be physically possible unlike your one. There is not the space for the N8 to rise above the N25 and drop back in time for the Glanmire junction. If you intend to keep the existing N25 flyover you'd be looking at an incline that many vehicles couldn't even manage.

nordydan's one has a slip sitting directly on top of the railway line at one stage...

murphaph

The Word Is Bor wrote: »

Vertical alignment from tunnel to N8/M8 would not be achievable.

Agreed, but didn't want to be the one to break the bad news to mysterious. He's looking at a 20~30% gradient to the tunnel mouth. Imagine trucks climbing out of the tunnel to a 30% gradient!

nordydan

MYOB wrote: »

nordydan's one has a slip sitting directly on top of the railway line at one stage...

My drawing was done in about 10 secinds in fairness!

Overheal

mysterious wrote: »

Here is a Map of existing Dunkettle








Here is my first one. The N25 free flow layout.


This is the best I can do With MS paint.:) If I had better tools it would be much easier.

• 3 extra bridges
• And Mainline N25 widened to facilitate merging movements.
• All movements are free flow.
• Existing roundabouts underpasses used
• Inexpensive and efficient layout.

These are not professional drawings. I cannot work out the exact measurement and aspect to scale using the tools that I have.

Now you're thinking American.

A good place to study would be Los Angeles.

mysterious

Noooo Overheal.


I'm thinking common sense. To be honest I find what you said insulting.

Sponge Bob

Overheal wrote: »

Now you're thinking American.

No he ain't , an American would build another tunnel under the tunnel coming out and merging near Glanmire

mysterious

Sponge Bob wrote: »

No he ain't , an American would build another tunnel under the tunnel coming out and merging near Glanmire

Overheal I'm glad I don't think like America and I'm sure glad I don't think like anyone else. I'm glad that I think for myself.

I was going to say something else about Overheal's comment.

But I'll bite my lip.

Road-Hog

No disrespect to mysterious etc but without having any vertrical and horizontal information on the existing alignment and a topographic survey of the adjacent lands its almost pointless doodling with MS paint etc using aerial photographaphy only, from my limited knowledge of road/interchange design there are all sorts of min, max and transition curves in the horizontal, hog and sag curves in the vertical and also max and min gradients and superelevations to take into account and not to mention potential archaeological, CPO, ecology and environmental issues. unfortunately all these issue too often can turn relatively straight forward looking upgrades majorily complicated projects. It would be interesting however to get some information on the proposals if any that there are from NRA or whoever they have farmed out this work to?

Irjudge1

mysterious wrote: »

Here is a Map of existing Dunkettle








Here is my first one. The N25 free flow layout.


This is the best I can do With MS paint.:) If I had better tools it would be much easier.

• 3 extra bridges
• And Mainline N25 widened to facilitate merging movements.
• All movements are free flow.
• Existing roundabouts underpasses used
• Inexpensive and efficient layout.

These are not professional drawings. I cannot work out the exact measurement and aspect to scale using the tools that I have.

I need some help here. For clarity I'm going to ignore the fact that orientation of the drawing is 180 Degrees out.

So if approachng from the West /Right and you wish to Head Northwards to the tunnel how do you get there? I cant see a connection onto the Northbound road. The road you are on simply travels under the North/South Dual C/W and leads you back to the road you came off?

mysterious

The Large Loop was there provided for it. Good spotting. I totally forgot to put that arrangement fully in.:o

I wil fix it.

Poster King

I'm loving this thread. Have done lots of this amateur junction layout stuff myself over the years.

The Naas Road - Long Mile Road junction is one junction that needs to be sorted out. see attached (I've not made an attempt to redesign yet)

I consider myself a competent and traffic aware driver, but still get nervous any time I approach this junction. Not long ago I witnessed 3 accidents (one quite serious and 2 minor) in the space of 2 minutes at this juntion on a fiday evening.
It is one of the craziest juntions. I simply can't believe that they did not put the Luas on a bridge.
(I'm sure there has been a thread on this before - if anyone could point me in the right direction it would be great)

nordydan

Poster King wrote: »

I'm loving this thread. Have done lots of this amateur junction layout stuff myself over the years.

The Naas Road - Long Mile Road junction is one junction that needs to be sorted out. see attached (I've not made an attempt to redesign yet)

I consider myself a competent and traffic aware driver, but still get nervous any time I approach this junction. Not long ago I witnessed 3 accidents (one quite serious and 2 minor) in the space of 2 minutes at this juntion on a fiday evening.
It is one of the craziest juntions. I simply can't believe that they did not put the Luas on a bridge.
(I'm sure there has been a thread on this before - if anyone could point me in the right direction it would be great)

I don't think this junction is upgradable in fariness, does the luas not need a very long incline and decline for its potential bridge?