As many of you know, Toronto has a highly successful public space underneath the Gardiner Expressway called The Bentway. I have ice skated in this space during the winter and I have listened to hard techno in this space during the summer. It has become a public space anchor in the city. Ilana Altman and the team are doing great work. And this week, they just announced that Field Operations (New York) and Brook McIlroy (Toronto) have been hired to design a major expansion. Called The Bentway Islands, this next phase consists of three "islands," totalling 11,500 m2 (~125,000 ft2).
Here's a map:

And here's what the spaces look like today:


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Both of these firms do fantastic work, and so I'm excited to see what they come up with. (Field Operations is the firm behind New York's High Line.) But if I can offer two unsolicited (yet related) suggestions, they would be: 1) Let's incorporate more commercial uses and 2) let's aim for these three parcels to not actually feel like urban islands. Generally speaking, the spaces underneath highways aren't the most desirable. They also tend to be surrounded by inhospitable urban environments. Stitching them in and creating continuity in the fabric of the city (existing example, here) is the best way to make the highway above more or less disappear.

This is an interesting map to play around with. It allows you to see how many 15-minute neighborhoods and cities there are around the world. And it works by calculating the average time it takes to walk or bike to the closest 20 points of interest in 10,000 cities. These points include all of the usual suspects like places of work, schools, healthcare institutions, grocery stores, and so on. A blue cell indicates an average walk time < 15 minutes, and a red cell indicates an average walk time > 15 minutes. The darker the color, the shorter or longer the average time in minutes.
By this measure, it's hard to beat many/most European cities. Here are Paris and Barcelona:

In 2019, London implemented something known as an Ultra-Low Emission Zone (or ULEZ). The intent was to reduce the number of older and higher-polluting vehicles entering and driving around the city.
It works like this: If you have a vehicle that does not meet the ULEZ emission standards, you need to pay a daily charge of £12.50. This applies all day every day (except Christmas) and it is in addition to London's congestion charge.
It's also done entirely through license plate cameras. If you enter the zone, don't have an approved plate, and don't pay the charge within a few days, you get sent a fine. The result is that London's ULEZ is now the largest clean air zone in the world (at least according to London).
It also achieved its intended purpose. In 2017, only 39% of cars entering London would have met the ULEZ emission standards. Today the number is over 95%. Meaning, most people don't actually pay the charge.
At the same time, nitrogen dioxide levels in the zone have more than halved, improving overall health outcomes. It's a perfect example of taxing the things you want less of. What's also interesting is that there were positive second-order consequences.
Vehicle traffic as a whole declined by about 9% in the first year, with no evidence of displacement to other areas. And according to this research study, it actually encouraged more kids to walk and take other forms of "active transport" to and from school.
Seems like a no brainer to me.

The city propers are completely blue, and you have to go pretty far out (or up into mountains) to find areas that don't have 15-minute conveniences.
Toronto has a strong core and isn't terrible overall, but expectedly, we aren't as uniform and as deep blue as Paris and Barcelona:

Where things get really interesting, though, is when you look at cities like Dallas and Houston:


It's clear where these cities stand on walkability.
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