Most of my new writing will be over on Substack … So, if you don’t already, follow me over there, as this blog becomes static, frozen in time.
You can find the new RSS feed at https://transportist.substack.com/feed .
Most of my new writing will be over on Substack … So, if you don’t already, follow me over there, as this blog becomes static, frozen in time.
You can find the new RSS feed at https://transportist.substack.com/feed .
A collection from my #NearerInTime hashtag on #TwitterRIP.
The ideas behind #NearerInTime are several:
Television
Movies
Music
History
Recently published:
This paper analyzes the emergence of two well-defined peaks during the morning peak period in the traffic flow diurnal curve. It selects six California cities as research targets, and uses California employment and household travel survey data to explain how and why this phenomenon has risen during the pandemic. The final result explains that the double-humped phenomenon results from the change in the composition of commuters during the morning peak period after the outbreak.
Recently published:
This research explores prioritizing network investment to improve walking and biking access in a suburban area with a poorly connected street network. This study’s methods provide a systematic approach to design and prioritize the potential links to improve active travel in the suburban environment. An access-oriented ranking system is proposed to prioritize the contribution of links in two evaluation processes for different travel time thresholds. One of the developing suburbs in Sydney is selected as the case study, and a list of potential links is identified. Results indicate that links with the highest added access per unit of cost are the links that have the highest impact if all links are built. However, the locational network structure surrounding the point of interest may affect the order. For a radial network, closer links lead to higher access, while for a tree-like network structure, connecting branches improve access significantly. Also, farther potential links are significantly dependent on the closer links in increasing accessibility for a specific location. This suggests that in order to utilize the network, there should be a sequence in constructing the potential links. The application of access-oriented network investment is also discussed.
The Daily Mail posts an article with this needlessly antagonistic headline: How Australian taxpayers will need to spend BILLIONS to transition from petrol and diesel to electric cars (which start at $47k for a VERY basic model) – as the ACT pushes ahead with a BAN on combustion engines by 2035 .
Contra the headline, the article itself is not bad.
My quotes:
Professor Levinson estimated the current infrastructure should be able to handle a market share above 20 per cent, given most cars will be charged at home.
‘This is not going to be a sudden crisis,’ he said.
…
Professor David Levinson, an American civil engineer and transportation analyst at the University of Sydney, said the federal government’s lack of commitment to the electric vehicle market was ‘disappointing’.
‘Given the potential abundance of renewables in Australia, this is disappointing, but the government has made few efforts to accelerate EV uptake with tax breaks or higher fuel or petrol car purchase taxes, and the previous government was talking down EVs as recently as the 2019 campaign,’ he said of Mr Morrison’s tenure.
…
Professor Levinson said he expects lower cost EVs to enter the Australian market in the coming years.
‘As the price of batteries drop, we would expect lower cost car-sized EVs to enter the market in Australia as they have in other countries. That will naturally increase market uptake,’ he said.
‘Inflation will raise the cost of everything, but the relative higher price of EVs should diminish, and Bloomberg expects a crossover point in a few years when EVs are less expensive that petrol cars.’
…
Professor Levinson believes Australia need to do more to combat the country’s ‘large share of carbon emissions’ and commit to electrifying its roads.
‘Converting new cars purchases to electric takes out tailpipe emissions. But old cars will remain on the road for years,’ he told Daily Mail Australia.
‘It will take about 20 years to turn over nearly the entire fleet from the point that almost all new cars are EVs (around 2030), without government incentives or mandates.’
Some additional points:
Recently published:
Abstract
Although it is widely reported that rail transit has the potential to encourage higher density development, it remains unclear whether rail transit leads to more mixed urban development across station areas. This article provides rare quantitative analysis of changes in land use mix around the rail transit system in Tianjin, China through an investigation into the spatial effects of a rail transit line which cuts across both highly developed and lessdeveloped areas. By using longitudinal data over a twelve-year period (2004–2016) and by comparing the entropy-based land-use mix index, the study shows that with the operation of rail transit, land use mix has increased in formerly low-mixed station catchments, but the change is not obvious for already highly diverse areas. It also shows that a more balanced development occurs in station areas with higher land use dominance, while the leading functions are intensified in station areas with lower land use dominance. By presenting a clear picture of the spatial distribution and patterns of land use mix changes over time, this article concludes that rail transit leads to more balanced development across different station areas in the context of China’s rapid urbanization. The outcome provides a base for further exploring how the planning of rail transit stations may help tackle the differentiated development in cities.
Keywords Rail transit · Land use mix · Spatial variations · Tianjin
Congratulations to Dr. Bahman Lahoorpoor for “satisfying the requirements for the award of the degree of Doctor of Philosophy at the University of Sydney.”
Thesis Title: “Terraces, Towers, Trams, and Trains : Examining the Growth of Sydney using Empirical Models and Agent-based Simulation“
Lead Supervisor: Professor David Levinson.
Abstract: Transport networks and land use are inter-dependent. This joint co-development process of infrastructure and building location is often theorised to be a positive feedback cycle: transport infrastructure produces accessibility that induces land development, which induces transport demand and increases accessibility, increasing the production of transport networks (i.e. inducing supply) and further intensifying land development. In Chapter 2 we investigate the critical elements of this dual connection between land use and transit. Sydney as a good example of a rapidly developing city, had public railway transport services beginning in the 1850s, which facilitated and responded to the development of suburbs. Chapter 3 explains how the historical railway network, including trams and trains, and historical population data are collected and digitised. A series of network characteristic measures and a metric for characterising the population distribution are also presented. In Chapter 4 we test whether trams expanded accessibility relative to buses by comparing the services provided by historical trams, the replaced bus services, and the remaining train and light rail networks. We compare 1925, when the tram system was at its peak, and 2020. In Chapter 5 we investigate the theory of interaction between land use and the transit network. We investigate the direct and indirect links between land development and transit investments using the concept of accessibility. We develop an empirical model to capture the Greater Sydney area’s historical evolution of land use and public transit networks. In Chapter 6 we develop a simulation framework to replicate the growth of railway networks by given exogenous historical evolution in land use. The framework is an iterative process that includes five consecutive components including environment loading, measuring access, locating stations, connecting stations, and evaluating connections.
Publications by Bahman Lahoorpoor include:
August 1 is of course best known in the transport community as TRB submission day. I hope everyone got their Transportation Research Board Annual Meeting papers out the door (virtually) and uploaded to the online system with a minimum of fuss. My plan, viruses and governments willing, is to attend in January for the first time since 2020. Maybe I will see some of the 3000 of you there.
[I was more engaged drawing this than just about anything I’ve done recently, I became a transport planner because I thought we would actually get to draw lines on maps. I’m sad that’s hardly part of the job. ]
Compared to comparably-sized cities in North America, Sydney does very well on Public Transport (Transit), with a pre-Covid 26% transit commute share. Compared to cities in Europe or Asia, it does poorly, indicating significant room for improvement.
Much of that difference has to do with wealth and space. Despite the complaints, Sydney is rich (money doesn’t grow on trees, but it does grow in rocks), so most families have cars. Sydney is also far less concentrated than cities in Europe or Asia, so distances are more amenable to the automobile and less to public transport, and the accessibility indicators show that.
Still, it’s clear more can be done.
There have been a forest of expired plans for public transport in Sydney. There are more plans still in the works. They almost entirely focus either on Trains (and especially Metros), or on specific lines that a particular party is pushing. But a detailed comprehensive look at the layer below the trains is missing.
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See also:
I did a Poll series. My Twitter Followers responses below, and are collectively inconsistent in my view (how can you favor lockdowns and not border quarantines, surely limiting international travel is less restrictive and affects fewer people, with the benefit of keeping the bad stuff out, than restricting local travel) (my answers with asterisk). [Of course, maybe people are interpreting this differently than my mental model of what a lockdown and a border quarantine is.]
Knowing what we know now, covid-19 lockdowns were:
Knowing what we knew then, covid-19 lockdowns were:
Knowing what we know now, covid-19 border quarantines were:
Knowing what we knew then, covid-19 border quarantines were:
We should at this time have lockdowns to prevent or reduce the spread of covid-19 and influenza
We should at this time close down borders (border quarantines) to prevent or reduce the spread of covid-19 and influenza
My Public Forum on Traffic Signals is available on the Ecotransit youtube:
Compared to comparably-sized cities in North America, Sydney does very well on Public Transport (Transit), with a pre-Covid 26% transit commute share. Compared to cities in Europe or Asia, it does poorly, indicating significant room for improvement.
Much of that difference has to do with wealth and space. Despite the complaints, Sydney is rich (money doesn’t grow on trees, but it does grow in rocks), so most families have cars. Sydney is also far less concentrated than cities in Europe or Asia, so distances are more amenable to the automobile and less to public transport, and the accessibility indicators show that.
Still, it’s clear more can be done.
There have been a forest of expired plans for public transport in Sydney. There are more plans still in the works. They almost entirely focus either on Trains (and especially Metros), or on specific lines that a particular party is pushing. But a detailed comprehensive look at the layer below the trains is missing.
I believe that removing rather than recapitalising most of Sydney’s Tram network was a mistake, and the evidence of Melbourne’s popular Tram service is as close to case-control comparison you can find in this field. Sydney has higher transit mode share than Melbourne, but that is because the Trains are so much better (higher frequency), not because people like the buses better than the Trams.
Still, that does not mean the trams should all be put back. First, Sydney cannot build everything on the historic maps, at least not all at once, even Chinese Metros have been built over phases. Even more significantly, you do not want to:
I have been thinking about a “blank slate” redo of Sydney surface public transport (buses and trams). This is something the Government could do in a decade if they applied themselves.
You can see a detailed version in Google Maps here. You will need to zoom out, as it centers on the Liverpool CBD (the geographic center of the region). As always feedback is welcome.
The Figure below shows the Existing, Under Construction, and the Sydney FAST 2030 Proposal LRT Lines.
The Proposed Lines are discussed below:
Buses have not received the attention they deserve. We could do much better with buses than we actually do, but elite projection (elites can imagine themselves riding trains but not buses) is hard to overcome, so buses are regarded as inferior to trains for reasons that mostly have to do with how we use buses in the system, rather than the technology itself. [Recognising that the ride quality of buses on streets is not as high as trains on exclusive rights-of-way]. This vision for Rapid Buses is not T-Ways (on exclusive rights-of-way) everywhere, but more akin to the Arterial Bus Rapid Transit services that Metro Transit in Minnesota provides. (You can see a nice video about the service). In short, buses are the workhorse of the public transport system, and need more attention to make them as excellent as possible.
The services are gridded, so they are divided into H-Lines and V-Lines. Specific lines are itemised below.
Shown in pale blue, East-West or Horizontal (“H”) Lines (always even numbers, major lines end in 0, lowest numbers in the North, highest in the South)
Shown in light purple, North-South or Vertical (“V”) Lines (always odd numbers, major lines end in 5, lowest numbers in the East, highest in the West)
Physical geography is always a factor. Because of the width of Sydney compared to the height, there are more V-Lines than H-Lines. Also, based on the principle of non-redundancy, more vertical bus routes are provided, as there are more existing and under construction horizontal train lines.
Note this service stops in Liverpool, as the areas west are not developed yet. We have ideas about that, and I am currently doing work in the area, so will abstain.
If any of these H- or V-Lines are successful, they can of course be upgraded, and as the physical rail network changes, one expects these lines will evolve as well, taking advantage of the flexibility offered by buses. I have not conducted a formal accessibility analysis of this FAST network proposal, but if you are interested in funding something, find me.
This vision is essential if public and active transport are to be the preferred choice for most Sydneysiders, which is critical for achieving the environmental goals of eliminating CO2 emissions.
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