Whoopsie! Sydney’s road planners just discovered induced demand is a thing, after opening a new motorway.
For those outside Sydney, the New South Wales state government recently opened a new spaghetti intersection just west of Sydney’s Central Business District.
It was supposed to solve traffic. Instead, it’s turned into a giant car park:
"For the third straight day, motorists and bus passengers endured bumper-to-bumper traffic on the City West Link and Victoria Road. A trip from Haberfield to the Anzac Bridge on the City West Link averaged an agonising 44 minutes in the morning peak on Wednesday.
"Several months ago, Transport for NSW’s modelling had suggested traffic from the interchange would add only five to 10 minutes to trips on Victoria Road through Drummoyne and over the Iron Cove Bridge during morning peaks.
“Those travel delays have now blown out.”
So what do motorists say when their shiny new road that was supposed to solve traffic instead turns into a massive traffic jam?
‘Dude! Just one more lane!’
From the article:
"[Roads Minister John] Graham and his Transport boss Josh Murray appear reluctant to do what many motorists reckon is the obvious solution.
“That is, add lanes or make changes at the pinch-points that are causing the pain. A three-lane to one merge point from Victoria Road onto the Anzac Bridge, along with two lanes merging into one on the City West Link, are proving to be painful bottlenecks.”
#roads #traffic #cars @fuck_cars @sydneytrains @urbanism #urbanism #UrbanPlanning #motorways #fuckcars
While the money sold have been spent on public transport, it’s a bit fucking premature to put this down to induced demand - the tangled mess has been operating for what - like 3 business days? People are getting confused and doing silly bullshit. It’s a problem, but it’s not induced demand.
Induced demand is a thing, and it’ll almost certainly be relevant here - there’s no need to lie about it - give it a minute to settle first. This is the benefit of being correct - there’s no need to be dishonest.
I came here to point this out and love the way you stated it. Confusion, hesitation and unnecessary lane changes are what create traffic. There has never been a major highway development in history that didn’t cause at least some short term issues. We should give city planners a bit more credit than that
No, volume of cars is what creates traffic.
Edit: you’d think that in a fuck cars community, of all places, we’d all be able to agree on this basic principle. We’re apparently infested with six idiot trolls who think cars don’t cause traffic and that induced demand isn’t real.
The volume of cars is a scale factor that determines the impact of traffic causing behaviors and conditions for free flowing highways (no traffic lights, stop signs, etc.). Following too closely and improper lane changing are two specific behaviors that actually create slow downs. There are numerous models that simulate this.
Yes, yes, I’m well aware of how it works (I’m a former traffic engineer IRL). Although it’s true the behaviors trigger the slowdowns, it’s the traffic volume that creates the conditions where switching to the congested flow regime becomes possible.
In other words, if high traffic volumes aren’t present, those behaviors don’t have that consequence, and moreover, if high traffic volumes are present, the free-flow regime is such an unstable equilibrium that some kind of event (even one as minor as a driver briefly tapping their brakes) triggering a shift away from it and to the congested regime is inevitable. It’s the volume that’s the essential condition, not the behavior.
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Are you sure the post is just a mistake or misunderstanding? Maybe it’s just dishonest. ‘You’re ignorant or stupid’ seems a bit much.
I’d be more willing to accept innocent ignorance in the replies - I assume that if someone is posting a new thread about a situation that includes a judgement on the cause of that situation, they at least have a passing familiarity of the thing they’re publically passing judgement on.
They’re very obviously wrong in a way that discredits the good ideas put forward by the participants in this sub - if they retract their post, I’ll happily retract mine.
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Induced demand is (like I said) definitely a thing, and will almost certainly be a meaningful factor here, but to point to massive delays a couple of days after opening the most complex underground road network in the world, where loads of people are stopping after taking wrong turns (e.g. the side you access the Anzac bridge has switched) is obviously not induced demand.
Let the immediate adjustment period cool off, then take a look at it - I’m sure the induced demand will be there. There’s no need to point to teething issues immediately after opening and call that induced demand - it discredits the very concept.
I lived a few hundred meters from it, and currently live a few km from it - not that I think it’s relevant to this discussion.
@WaxedWookie @AvonVilla I fundamentally disagree that induced demand isn’t at play here.
That’s because this spaghetti intersection isn’t a standalone project. It’s part of WestConnex.
For *years* before it opened, the state government promised that WestConnex would deliver faster travel times from Western Sydney to the CBD. They promised faster travel times from the southern suburbs to the city. This was going to end traffic congestion on Parramatta Road once and for all.
This is directly off the WestConnex website:
"The New M4, opened in July 2019. The WestConnex M4, including the 5.5km New M4 Tunnels, connects Haberfield to Parramatta and the M4. Motorists on this section of WestConnex are saving an average of 35 minutes on their westbound peak time journey compared to Parramatta Road.
“The M8, opened in July 2020. The 9km twin tunnels connects the M5 at Kingsgrove to a new interchange at St Peters, with 6ha of new open space, built on a remediated former landfill site. The tunnels cut up to 30 minutes off a trip between Liverpool and the southern CBD.”
https://www.westconnex.com.au/explore-westconnex/about-westconnex/
Here’s a direct quote from Gladys in 2018:
"If you’re coming from Liverpool you’ll save about half an hour, if you’re coming from [Oatley area] you’ll save about 15 minutes.
“When this project has finished, not only will you have less traffic on local roads, because traffic will be underground, but you’re also going to be given open space you didn’t have before.”
https://www.smh.com.au/national/nsw/world-s-worst-park-westconnex-s-new-st-peters-spaghetti-junction-20180814-p4zxel.html
And people made decisions about where they would live and how they would travel based on WestConnex.
That instead of being stuck on Parramatta Road, they’d get a nice quick commute down the M4 to the city. Or that they’d be able to take the M5 through the new M8 motorway tunnel to the city.
And a lot of that traffic is now heading straight to the Anzac Bridge:
“Before the Rozelle interchange opened, seven lanes merged into four on the Anzac Bridge. Now, 10 lanes are merged into four with the extra lanes from the spaghetti junction.”
““It is a forever problem because the system is funnelling too many people into a road that is too small. They assumed the Anzac Bridge could support more cars than was physically possible,” [Sydney transport expert Mathew Hounsell] said.
"“Trying to shovel a motorway into the middle of a city was never going to work. The previous government and the roads department stuffed it up. They didn’t want to listen to anyone who would tell them it was not going to work.
“The former Coalition government stated repeatedly that traffic flows on Victoria Road would be reduced by 50 per cent when the interchange opened, a “claim that is laughable now” [Inner West Council mayor Darcy Byrne] said.”
https://www.smh.com.au/national/nsw/it-s-a-forever-problem-experts-say-rozelle-hell-is-here-to-stay-20231130-p5eo2o.html
@WaxedWookie @AvonVilla When the prime minister, the state premier, and the transport Minister all hype up an infrastructure project by promising less traffic to the city, many people will make transport decisions accordingly.
That’s the big picture here.
Here’s an example of the hype the federal and state governments were building for *years* around WestConnex and the Rozelle Interchange:
"Prime Minister Scott Morrison said the $16.8 billion project was cutting travel times and supporting thousands of families with work as Sydney and Australia were reopening from COVID lockdowns.
"“This breakthrough isn’t just for a tunnel, but it’s a breakthrough for getting people home sooner and safer and helping workers to move around,” the Prime Minister said.
"“As well as the 9,000 jobs this project has been delivering, the tunnel is going to make it easier for people across Sydney to pick up work and jobs that just wouldn’t have been possible before with traffic.
"“As we reopen Sydney and Australia, projects like this bypass and our record $110 billion infrastructure investment are going to give our economy even more of a boost.”
"New South Wales Premier Dominic Perrottet said the third stage of WestConnex is now another step closer to forming a western bypass of the Sydney CBD.
"“This project will change the lives of thousands of people, bypassing dozens of sets of traffic lights and allowing an uninterrupted drive from the Blue Mountains to Rozelle,” the Premier said.
"“As part of the New South Wales Government’s record $108.5 billion investment pipeline, WestConnex is already easing congestion, creating jobs and connecting communities, right across our city.
"“Our Government has its eye to the future and this breakthrough will complete a ‘missing link’ between the new M4 Tunnels at Haberfield and the M8 at St Peters.”
"Federal Minister for Communications, Urban Infrastructure, Cities and the Arts Paul Fletcher said the Commonwealth Government had co-funded WestConnex from the outset with a grant of $1.5 billion and a concessional loan of $2 billion.
"“This is a major milestone in what is one of the most significant road infrastructure projects in the country, which is already delivering major benefits for Sydney commuters by reducing travel times, easing congestion and improving safety,” Minister Fletcher said.
"“When opened to traffic in 2023, the M4-M4 Link Tunnels and Rozelle Interchange will complete the WestConnex project, providing improved links between key employment hubs and local communities.”
"NSW Minister for Transport and Roads Rob Stokes said 22 of the 33 kilometres of WestConnex would be underground, including the 7.5 kilometres that make up the M4-M5 Link Tunnels.
…
““The M4-M5 Link Tunnels will remove tens of thousands of vehicles from surrounding streets, including Parramatta Road, and will help slash up to 40 minutes from an average peak journey between Parramatta and the Sydney Airport.””
https://www.acciona.com.au/updates/news/westconnex-m4-m5-link-tunnels-the-final-breakthrough/?_adin=02021864894
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Brevity isn’t your strong suit. I’ll keep this simple.
I assume you wouldn’t argue that the current delays will sustain for the foreseeable future. The induction drivers won’t disappear for the foreseeable future. With those 2 things being true, how could you say these delays are induced demand rather than temporary teething issues with opening?
@ajsadauskas @WaxedWookie @AvonVilla The Anzac bridge has been close to capacity in peak as long as I can remember and I’ve lived here 15 years. Even if there were two Anzac bridges, then what? You’d need two CBDs for all those cars to enter.
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