There was a good article a few days ago by Brent Toderian in Toronto’s Metro News highlighting that if you use the “math of city-making”, which is often at odds with the way cities have developed over the last 60+ decades, you can build a better city. Brent has visited Auckland a few times to work with the council on planning issues and has talked at a number of Auckland Conversations events including here in 2013 and here a year later.
Here are some of the examples he uses in his article.
- A common political argument is that bike and transit riders should “pay their own way.” A study in Vancouver however suggested that for every dollar we individually spend on walking, society pays just 1 cent. For biking, it’s eight cents, and for bus-riding, $1.50. But for every personal dollar spent driving, society pays a whopping $9.20! Such math makes clear where the big subsidies are, without even starting to count the broader environmental, economic, spatial and quality-of-life consequences of our movement choices. The less people need to drive in our cities, the less we all pay, in more ways than one.
- Another study in Copenhagen (where the full cost of transportation choices are routinely calculated) found that when you factor in costs like time, accidents, pollution and climate change, each kilometre cycled actually gains society 18 cents!
- A recent American study suggested that compact development, on average, costs 38 per cent less in up-front infrastructure and 10 per cent less in ongoing service delivery than conventional suburban development, while generating 10 times more per acre in tax revenue. Many cities overbuilding the suburbs are putting their fiscal future at risk — and that’s before the bigger picture costs are even included.
- Over the last decade, Canadian cities like Calgary, Edmonton, London, Halifax, Regina and Abbotsford have been doing the hard math on the real costs of how and where they grow — not just up or out, but how smarter design choices save costs. The resulting math has been powerful — tens of billions of dollars more of public cost for car-dependant suburban growth than for smart infill — and I haven’t even yet seen such a study that includes all the full and life-cycle costs of our growth choices. Once these shocking numbers are revealed, municipal leaders can’t “un-know” them, no matter what political ideology they live by.
Want more examples? There’s math showing that replacing on-street parking with safe, separated bike-lanes is good for street-fronting businesses. That crime goes down as density goes up. That providing housing for the homeless actually saves public money. That you can move more people on a street when car lanes are replaced by well-designed space for walking, biking and transit.
There are of course many others we’ve seen and covered over the years, including many local studies that have shown the same results as above. Do you have any city math favourites?