Congested Junction - Solution

cherrytaz

Hi all,

As part of a project I have to chose a junction (probably in Dublin) that at the moment experiences congestion etc so that it can be modeled using VISSIM software and perhaps steps put in place to improve the efficiency of the junction. I was thinking of the obvious ones such as the intersections of the M50 but many of these are already complete.

Any suggestions?, perhaps any that may include bus lanes/bike lanes etc. I was also considering the intersection at Christchurch Cathedral and Patrick Street but I don't really think any improvements can be made here due the shear volume of traffic that uses this stretch of road.

Cheers

Cherrytaz

Cookie_Monster

This one: http://maps.google.com/?ie=UTF8&hq=&hnear=Dublin,+County+Fingal,+Ireland&ll=53.182195,-6.132871&spn=0.001366,0.005187&z=18

Causes tailbacks all the way to the M50 M11 merge, 6km away

cherrytaz

Thanks for that. Will have a more detailed look at it and see what can be implemented.

Tickityboo

Try Newlands Cross

cherrytaz

The Newlands Cross one would indeed seem like a good choice. After some research it seems that it was at tender stage a few years ago with no sign of any works taking place and with the country in the state it is it doesn't look like such projects will proceed anytime soon.

I suppose the solution is to construct a grade separated junction to create free-flow conditions. From using the N3/M50 interchange regularly it really is a huge improvement with congestion seriously reduced. The impact on traffic during construction is obviously going to be a serous issue but if is structured correctly it would provide a suitable solution.

Cheers for the proposals.

Losty Dublin

Dorset Street and either Gardiner Street or the NCR would be a good one to look at as they are a perennial danger, OP.

dazmetron

Cookie_Monster wrote: »

This one: http://maps.google.com/?ie=UTF8&hq=&hnear=Dublin,+County+Fingal,+Ireland&ll=53.182195,-6.132871&spn=0.001366,0.005187&z=18

Causes tailbacks all the way to the M50 M11 merge, 6km away

There are plans to redesign this junction as was discussed on this forum back in June so perhaps this wouldn't be the best of junctions to recommend.

See here for more details: http://www.boards.ie/vbulletin/showthread.php?threadid=2055951142

The pdf link from Wicklow CoCo in the thread goes into it in great detail including the VISSIM simulations already carried out.

Cool Mo D

I would pick this city-centre junction. It's a disaster as it mixes traffic going inbound and outbound for a while.

This would be another candidate for it's truly bizarre setup.

trad

I have a book here somewhere called "Urban Intersection Control" if you are interested.

Cookie_Monster

Cool Mo D wrote: »

This would be another candidate for it's truly bizarre setup.

yeah, thats a total disaster of an intersection

Chris_5339762

Terenure town.

http://maps.google.com/?ie=UTF8&hq=&hnear=Dublin,+County+Fingal,+Ireland&ll=53.309628,-6.284502&spn=0.004513,0.013937&z=17

No idea what could be done with it but it can be a 20 minute wait at rush hour.

HonalD

cherrytaz wrote: »

Hi all,

As part of a project I have to chose a junction (probably in Dublin) that at the moment experiences congestion etc so that it can be modeled using VISSIM software and perhaps steps put in place to improve the efficiency of the junction. I was thinking of the obvious ones such as the intersections of the M50 but many of these are already complete.

Any suggestions?, perhaps any that may include bus lanes/bike lanes etc. I was also considering the intersection at Christchurch Cathedral and Patrick Street but I don't really think any improvements can be made here due the shear volume of traffic that uses this stretch of road.

Cheers

Cherrytaz

Cherrytaz, the biggest problem you habe is to pick a junction that is not effected or effects adjacent junctions. Your best bet is to pick one that is close to the M50 but inside the "ring". Try the Long Mile Road Junction with Walkinstown Avenue. It is congested on occasions, has good n-s, e-w movements and is not too close to adjacent junctions. The junction at the Templeogue Bridge/Cypress Grove Road junction is also one to consider.

Northside, the BallymunRoad/Collins Ave Junction or the Finglas Road/Main Street ones are also possibilities.

As it is for a project, don't over-complicate it and pick a layout that is straightforward! Enjoy! :cool:

testarossa40

cherrytaz, before you dismiss M50 exits entirely, consider for instance the s/b Ballymount off-exit during the morning. Since the works completed last February until early September there were very few issues there, but since September we're seeing significant congestion & queuing at that exit every single morning now causing tailbacks all the way back to the Lucan exit & beyond. Something has changed for the worse (layout, signal sequences, etc) and it would be interesting to say the least to identify & document.

cherrytaz

Thanks guys for all the suggestions, appreciate it. Its a bit more difficult when your a student and don't experience difficult junctions on a regular basis as most working people do. Up to now my main concern would have been the m50/n3 interchange at Blanchardstown and the towns along the way (navan, dunshaughlin,kells etc) but since the opening of the m3 this is no more. I will have a look at all suggestions and report back on how I get on.

shafaql

Hi cherrytaz,
I am carrying out the same type of project in college, But I havn't a clue how to use VISSIM, I was wondering if I could maybe get grinds of you.
Thanks

CIE

Cookie_Monster wrote: »

This one: http://maps.google.com/?ie=UTF8&hq=&hnear=Dublin,+County+Fingal,+Ireland&ll=53.182195,-6.132871&spn=0.001366,0.005187&z=18

Causes tailbacks all the way to the M50 M11 merge, 6km away

Why am I reminded of the original junction between the Lucan Road and the M50 when I look at that...? Seems to me that for the cost to rebuild that interchange, you could have thrown in a bridge connecting the two halves of the Old Lucan Road going from Palmerstown Village past the King's Hospital and Deadman's Inn. (Why did they build on top of the old Lucan Road at all if they were going to convert parts into a motorway? Would have been a lot more useful to have an elevated motorway going over Kennelsfort Road instead of a dual carriageway going across it, and still have the option of using the traditional Lucan Road.)

Cool Mo D wrote: »

I would pick this city-centre junction. It's a disaster as it mixes traffic going inbound and outbound for a while.

This would be another candidate for its truly bizarre setup.

Both ends of Pembroke Street were a disaster both before and after the Lower Leeson Street bus lane. Baggot Street's too narrow west of Pembroke Street to have a contra-flow bus lane for the 10 (now 39A) to reach Ely Place at least.

And does anyone here remember when Clare Street was one-way westbound, and all traffic coming off South Leinster Street headed for Merrion Square North had to go around on Lincoln Place and Lower Merrion Street? City-bound traffic had to mingle with that traffic on Lincoln Place to reach Westland Row.

highdef

Looks simple on the map but it's a damn tricky one, if coming from the park or Blackhorse Ave.... http://maps.google.com/?ie=UTF8&hq=&hnear=Dublin,+County+Fingal,+Ireland&ll=53.370906,-6.333184&spn=0.002586,0.006968&z=18

Del2005

How about this one at the Beacon in Sandyford?

There was a thread recently about it, the person was trying to turn left onto Blackthorn Dr coming from the M50 Northbound and couldn't.

CIE

highdef wrote: »

Looks simple on the map but it's a damn tricky one, if coming from the park or Blackhorse Ave.... http://maps.google.com/?ie=UTF8&hq=&hnear=Dublin,+County+Fingal,+Ireland&ll=53.370906,-6.333184&spn=0.002586,0.006968&z=18

That junction hasn't changed in decades. Still looks the same as well. At least there are fewer bus routes going through Castleknock than in the past...the 39/A/B/C (at various points in time) and 70 all used to go through there.

Del2005 wrote: »

How about this one at the Beacon in Sandyford?

There was a thread recently about it, the person was trying to turn left onto Blackthorn Dr coming from the M50 Northbound and couldn't.

Due to congestion? I can see how, since going westbound on Blackthorn it narrows down to one lane after the intersection.

bigar

As far as moronic traffic layouts are concerned Hart's Corner is top of the list for me.

This really needs a solution but I doubt there is one without tearing half the buildings down here or closing Botanic Road in at least one direction probably pushing the problem more north.