Brandon Donnelly — Daily insights for city builders. Published since 2013 by Toronto-based real estate developer Brandon Donnelly. — Page 552

Berlin is considering something pretty radical. A grass roots movement called Volksentscheid Berlin Autofrei, or the People’s Decision for Auto-Free Berlin, is trying to turn the entire core of the city into a car-free zone. (There would be some exceptions and so we should maybe call it primarily car free.)

The area in question is everything inside of the city's circular S-Bahn train line (pictured above), which would make it the largest car-free zone or mostly car-free zone in the world. It's larger than Manhattan and it's about the size of London's zones 1 and 2, to help give you a sense of the scale.

So far the group has collected about 50,000 supportive signatures and, according to Fast Company , the Senate of Berlin is set to make a decision on the proposal next month. I have no idea how much community and/or political momentum this actually has, but I love how bold of an idea this is.

Is it too bold?

Again, it is perhaps useful to flip the question and use Seth Godin's status-quo-bias-checker model when thinking about this. If the center of Berlin was already car free and a community group had just come forward with a plan to now allow vehicles, how do you think you'd feel? I could see that being contentious.

Do you think Berlin should do it?

Image: City of Berlin via Fast Company

The latest US consumer price index report was recently published and for the 12-month period ending December 2021, the all items index rose 7.0%. This is the largest 12-month increase since June 1982. Here's a breakdown:

• Gasoline (all types): +49.6%

• Used cars and truck: +37.3%

• Meats/fish/poultry/eggs: +12.5%

• New cars: +11.8%

• Food at home: +6.5%

• Electricity: +6.3%

• Food away from home: +6.0%

• Apparel: +5.8%

• Transportation: +4.2%

• Shelter: +4.1%

The obvious standouts here are the price of gasoline and the price of used cars and trucks. Too much demand and not enough supply, it would seem. But the other conspicuous line item for me is shelter at only 4.1%. Is that it?

As Charlie Bilello points out in his latest newsletter, US rents were estimated to be up about 17.8% in 2021 (the highest increase on record according to Apartment List) and the Case-Shiller US National Home Price Index was similarly up about 19% year-over-year.

I also just glanced at the latest Urbanation rental report that came out today, and condominium rents were up 10.8% year-over-year here in the Greater Toronto Area. So I don't know about this 4.1% number. But maybe I just missed something in the fine print.

So slime mold, which is a fungus-like single-celled organism, has a tendency to build highly optimized networks across its food sources. In other words, if you scattered a bunch of food on a surface and then dropped in some slime mold, it would naturally create an interconnected web of linked veins across this surface. And this web would be based on the shortest and most efficient paths of travel between the various food sources.

I am mentioning this odd factoid because ten years ago researchers in Tokyo used this naturally occurring phenomenon for the purposes of trying to improve transportation planning. What they did was map out greater Tokyo. They then placed oat flakes (i.e. food) in spots that correspond to the various cities and urban centers that surround the city. Alongside this, they blocked off the areas where transportation networks do not typically run, such as through mountains and into the water. They then dropped in some slime mold, wet the surface, and watched it grow.

What they found was that the resulting network was remarkably similar to Tokyo's actual rail network. The slime mold had found the most efficient routes, eliminated redundancies, and generally discovered the optimal way in which to connect its food sources. And if you think about it, this is basically what transit networks are supposed to do. They should connect clusters of people in the most efficient way possible.

It has been a decade since this slime mold transportation discovery was first publicized, and it would seem that it hasn't really caught on as an invaluable planning tool. So I'm going to go out on a limb and suggest that we should take out a map of every major city in the world, plot its population centers, drop down some oat flakes, and then let slime mold tell us all the ways in which we are screwing up and over-politicizing our transportation planning efforts.

Thank you to Angus Knowles for making me aware of this study. Angus writes an occasional newsletter about cities and housing, over here .

Image: LiveScience