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“We assume that car use is an incompressible liquid that must be routed somewhere. But it’s more more like a gas that fills whatever space it is given.” —Ian Lockwood, Harvard Loeb Fellow, transport planner.

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The key is not to expand the space available to cars—that produces sprawl and unwalkable, unlivable cities. When you restrict the car space, and prioritize space for more efficient modes—that’s when you discover you have space left over for living.

In terms of the liquid/gas metaphor: a physicist tells me car traffic may be most like fluid in non-equilibrium flow (b/c different lanes have different speeds, and there’s no tendency towards a steady state—except perhaps the no-movement of gridlock)

Problem is that most people then assume that there is a certain level of highway infrastructure that you can reach where supply meets all demand, but this is almost never the case with mobility due to induced demand!

Fences and landscaping are often designed to discourage foot traffic. I think there are two reasons for this: 1. The realization that mixing cars and pedestrians is dangerous, so eliminate pedestrians. 2. The assumption that pedestrians are trouble. Juveniles, the poor etc.

lol, Yeah the lakeshore of Toronto is a good example of traffic & roads behaving like a Gas creeping through a city anywhere you'll let it. I've noticed that about larger, old cities with constraints of landscape & water in North America where people travel long distances. New York & Jersey is đź’©đź’©đź’©