Porsche released its first electric car back in 2019. It was the 2020 Porsche Taycan, which was fairly similar to the Porsche Panamera sedan in terms of price, performance, and styling, except that it was fully electric. So if you were in the market for a very expensive sedan, it was more about whether or not you wanted an electric vehicle or a vehicle with an internal combustion engine (ICE).

In the quarter in which it launched (Q4 2019), the Taycan ended up only representing about 7% of Porsche North America's overall sedan sales. But by the second quarter of the following year it was nearly 50%. And in the first quarter of this year (2021), it was over 80% of their sedan sales. That was fast. Pretty soon, I would imagine there will be no point in even making the Panamera.

Now, the Panamera and Taycan aren't exactly mainstream vehicles. But I found the above chart (which is from Bloomberg Green) interesting in that it feels like an all-things-being-equal kind of question. If you happen to be in the market for a six-figure Porsche sedan -- and all things are kind of equal -- would you rather an electric model or one that runs on gas? Already most people are choosing the former.

Here is a recent research paper by Christopher Barrington-Leigh and Adam Millard-Ball that looks at the connectivity of local street networks across the world. They refer to this as "street-network sprawl" and they measure it using a Street-Network Disconnectedness index (SNDi).

This is important for many reasons. Compact street networks with shorter blocks and fewer dead ends are far more conducive to different forms of mobility, including transit. Street networks are also incredibly sticky. Once laid, they rarely change. And if they do, it's over very long periods of time.

The study period in the paper is 1975 to 2013. What they found is that in 90% of the 134 most populous countries in the world, the street network has become less connected since 1975. What this means is that we have been making it harder to service our communities with transit.

That said, there has been a reversal in "high income" countries, most notably in North America. If you take a look at the above graphs, you can see a fairly dramatic drop off, signalling a reduction in the construction of low-connectivity streets. Southeast Asia, on the other hand, is trending in the opposite direction. Note Bangkok in the upper righthand corner.

For a copy of the full research paper, click here.

Images: Global trends toward urban street-network sprawl

There is something happening in many North American cities right now. We are starting to question the supremacy of zoning for only single-family homes.

This past summer, the state of Oregon passed policy requiring cities of 25,000 people or more to allow duplexes, triplexes, and fourplexes within their single-family home neighborhoods. Minneapolis is poised to do something similar with its Minneapolis 2040 plan (though it has been contentious). And, of course, here in Toronto we recently rolled out laneway suites all across the city. Small scale multi-family dwellings are also already permissible in some areas (though few are being built).

Some are calling this a YIMBY movement. But however you want to define it, it's an acknowledgement that, if the goal is to built up instead of out, perhaps it's time we look at the parts of our cities with the lowest population densities. I would also add that following my recent post on Paris vs. Vancouver, many seemed to gravitate (in the comments) toward the Parisian model -- even if it did result in over 50,000 people per square kilometer. Density, it would appear, is okay.

While positive, it remains to be seen whether these policy changes will result in a meaningful increase in housing supply. And a lot of that will come down to the details. As I have said before on the blog, the math can be challenging on these sorts of smaller projects, which is why you have smart people proposing things like an "inverse density" rule to help encourage more smaller scale development.

But as the saying goes, sometimes you need to crawl before you can walk. And, if nothing else, there's certainly symbolic value to what seems to be taking hold across North America right now.