Marco Chitti

Marco Chitti

@chittimarco.bsky.social

Researcher on urban planning and public transportation. https://marcochitti.substack.com/

7.1K followers390 following11.3K posts

Depicted: Traffic signals' poles in Magog (QC), Utrecht (NL), Helsinki (FI), and Stockholm (SE). In case you're still wondering why traffic signals have become so expensive to build in Québec.

My obsession with traffic signals' overdesign stems from the fact that they are relatively simple objects, and the bloat in their size and specs that burdens our built environment is particularly easy to see. Also, a symbol of the "quantity-over-quality" approach to design typical of NA engineering

Like, in Montreal, we have three sets of lights per intersection for local streets in the lowest traffic urban environment, but zero adaptive signal management. Traffic lights for the Stone Age.

What I really see here is a nice bus filter (with a car trap!) part of a broader circulation planning scheme. And I'm salivating 🤤🤤🤤

Bus-priority 🚌🚍@bus-priority.bsky.social

Okay but Stockholm is building a lot of bike infrastruttura. Check out this bike parking island used for traffic calming.

It's part of a broader redesign of circulation patterns on the eastern half of Sodermalm that transformed Katerinavägen from a through arterial to a bus-only through route. See the maps in the Transit Priority Atlas

The ZTL is a chameleon. It can be whatever you want. It can be adopted in any context, from city centers to mountain and rural roads. It's essentially the regulatory embodiment of the Dutch "autoluw" concept, adapted to the Italian cultural, political and bureaucratic context.

Tobias Watzl@tobiaswatzl.bsky.social

Probably the strangest ZTL I have ever seen. 😅 👀 @chittimarco.bsky.social

This is a great example of why the various "design guidelines" mandating volume articulation and changes of material are architecturally illiterate. This is a great building, and it's essentially a big box with a single well-thought architectural feature making most of the job.

Philip Oldfield@sustainabletall.bsky.social

Some strong shading elements in this design for 40 cooperative housing apartments in Barcelona Also includes a community kitchen, library and multipurpose hall By Lacol Architects

Unlike the random façade articulation, which is at best a poor mimicry of Arts & Crafts or other picturesque-inspired pastiches, the building-long veranda has a great tradition in Mediterranean/southern indian architecture, as the salient feature of otherwise simple façade.

By the way, we complain about building blandness but here the awnings do a lot of the job in creating actual articulation and... they are essentially banned in large parts of North America. All the condo rules I've seen ban awnings in Montréal.

I don't know if I just noticed it now or this has been a thing for a while, but Montréal changed the way traffic lights work in many of Ste-Catherine's intersection, out of an overzealous will of avoiding left/right-turn/ped conflicts (my understanding) and the pedestrian experience is now a mess.

View full thread

It seems like one if these cases when the excess of on paper "safety first" produces a less safe outcome: a traffic cycle that is not "credible" (as the French would say) and it's actually confusingly atypical so people have started not respecting it (many such cases).

I don't know if I just noticed it now or this has been a thing for a while, but Montréal changed the way traffic lights work in many of Ste-Catherine's intersection, out of an overzealous will of avoiding left/right-turn/ped conflicts (my understanding) and the pedestrian experience is now a mess.

It's mostly one-way /one-way intersections with high pedestrian flows and limited car traffic in St-Cath but very high ped traffic. It used to be a vanilla two-phase cycle with leading ped intervals. It's now a complex cycle with green for car + non-conflicting ped phases and ped-only ones.

Since there is limited traffic along St-cath, pedestrians walking along the street are left waiting for a longer red phase that exist to avoid the left-turn or right-turn conflict when most of the time there are no cars in St-Cath, so peds become very impatient (and rightfully so)

This Alberta referendum question, asking voters for proof of citizenship in provincial elections, smells like a US-imported culture-war non-issue. You can't vote if you aren't on the electoral list, and if you are, they've already confirmed you are an eligible citizen. So, what's the point?

The EU should put up a pre-registered message to any call coming from the UK as they fantasize about coming back again as a special child worth a special accommodation: "please remember that rejoining come with freedom of movement, full regulatory integration and eventually the €"

This post is unavailable.

The history of Canadian regulation, in four lines. Regulation-wise, I'm sorry to inform you folks that we amhave already become the 51st State. And we did it the way Trump wanted it: under economic coercion of the sort.

John Lansing@pipedreaming.bsky.social

More similar to the US codes than any other country unfortunately, though the plumbing code are slightly better in some ways.

Zoning? Very US style. Standards for elevators and escalators? A copy-pasted US ASME code, just translated into the metric system. Double-stair requirements? Even stricter than US ones. Etc etc.

Evolution has produced two sounds that are unbearable to the human hearing: toddlers' crying and French people, notably Parisian ones, complaining. They both trigger immediate, irrational action by reaching directly to the limbic system.

It's like an ambulance noise. I can hear them complaining three blocks away by the simple reverberations they produce and all the oufs and poufs and brefs

These new alternative 6 & 7 routes possibly being studied for CAHSR are interesting not only because they reduce cost, but because they shorten the main tunnel from base-tunnel length to a normal-tunnel length (<10km), something I can believe the US tunneling industry can, maybe, deliver.

josh vredevoogd@jawshv.bsky.social

probably related to CAHSR changing their engineering requirements to allow for steeper max grades. Looks like a lot less tunneling

Making a 20-25 km tunnel is much, much more long and complicated than making a 8-10 one. Because you can simply start excavation from one side, and you can maybe do more accurate geotechnical enquiries from the surface without a pilot tunnel etc.

As much as I love my home city, I worry about the state of urban cycling globally if Bologna is among the top 25. It's an ok cycling city, mostly because it's big student population, a large, car light core and a compact urban form. But cycling infrastructures are bad. Like 1990s bad.

Barely made the cut

Find someone who loves you as much as the Victorian-era Britons loved their cramped urban stations. (BTW, not sure I get the utility of reconstructing the road grid on top of those tracks to fit what looks like very local streets with a handful on-street parkings)

I'm hoisting this from an interesting exchange about platform height and path dependency because I think it's worth pointing out that the search for an "omnistandrad" is often one of the big drivers of costs. There is value in standardization, but there is also the risk of overdesign.

Marco Chitti@chittimarco.bsky.social

Engineers and planners need to understand the economic side of things. Making a standard that works for both 350 km/h HSR and your 80 km/h local diesel line is a perfect receipt for making the 80 km/h line close because it becomes uneconomical to upgrade and run.

View full thread

Ditto for railways. The dogma of interoperability means that RFI in Italy is upgrading many local lines to vanilla mainline rail standards (p.ex. 22.5 ton axle load) so they can potentially run Frecciarossa, bilevels regionals or freight trains on them... even though they probably won't.

Standards need to be tailored to an actual, realistic assessment of project-specific needs and contexts, and to alternative methods of achieving equal or very similar outcomes. Otherwise is like building any car to be a Ferrari and any truck to be deployed as armored vehicle in a war.

I'm hoisting this from an interesting exchange about platform height and path dependency because I think it's worth pointing out that the search for an "omnistandrad" is often one of the big drivers of costs. There is value in standardization, but there is also the risk of overdesign.

Marco Chitti@chittimarco.bsky.social

Engineers and planners need to understand the economic side of things. Making a standard that works for both 350 km/h HSR and your 80 km/h local diesel line is a perfect receipt for making the 80 km/h line close because it becomes uneconomical to upgrade and run.

If you look at urban rail station design, the will to have some "high-quality standard" written down in some form of soft or hard guidelines and regs is probably one of the main drivers of design bloat, because we hold to the same standard the 100k/day interchange and the 5k/day peripheral station.

Remember, when it comes to complex techno-social systems like the railways: "It's all path dependency" "It always has been"

Simon@simon514.bsky.social

The curse of platform heights strikes again: the 113 new battery trains for Lower Saxony will have doors aimed at two different platform heights (presumably 55 and 76 cm) because Germany couldn't manage to unify a standard 📶

Italy signed an MoU for mutual recognition of driving licences 10 years ago. Things have stalled since for a number of reasons, including the fact that Québec didn't want "Canada" to be mentioned anywhere in the agreement. I'm not kidding. Petty souvernanism all around us.

Like wdym Austria just stopped recognizing Taiwanese IDPs from May 2024 until Oct 2025, while Taiwan retaliated in kind, and no one knows why any of that happened? www.ocac.gov.tw/OCAC/Eng/Pag...

Because some fonctionnaire in Québec was triggered by the word "Canada", I and many others had to pass their driving licence exam twice. Nationalism makes people petty and honestly dumb.

It's a fascinating insight about how the Swiss think about traffic management. One of the goals of this setup is to reduce transit delay so rural buses can arrive at the station on time to not miss the timed connexion, but also for car queues to be pushed upstream, outside of the built-up area.

Dans la saga du REM de l'Est 1.0 -> PSE -> REM de l'Est version mini proposée par le PQ, les grands perdants sont les gens de Montréal-Nord: le pire désert de la grande région en termes de TeC structurant, mais malheureusement ils "n'ont pas de saints au paradis", comme on dit en Italie.