Permeability (spatial and transport planning)

Stephen Marshall differentiates connectivity as the number of connections, and permeability as their capacity. From light gray to dark, streets become less permeable to an increasing number of transport means such as trucks, buses, cars and bikes until only pedestrians have access to the narrowest, steep or stepped streets. Connectivity remains unchanged.[1]

In urban design, permeability and connectivity are terms that describe the extent to which urban forms permit (or restrict) movement of people or vehicles in different directions. The terms are often used interchangeably, although differentiated definitions also exist. Permeability is generally considered a positive attribute of an urban design, as it permits ease of movement and avoids severing neighbourhoods. Urban forms which lack permeability, e.g. those severed by arterial roads, or with many long culs-de-sac, are considered to discourage movement on foot and encourage longer journeys by car. There is some empirical research evidence to support this view.[2]

Permeability is a central principle of New Urbanism, which favours urban designs based upon the ‘traditional’ (particularly in a North American context) street grid. New Urbanist thinking has also influenced Government policy in the United Kingdom, where the Department for Transport Guidance Manual for Streets says:[3]

Street networks should in general be connected. Connected or ‘permeable’ networks encourage walking and cycling and make places easier to navigate through.

  1. ^ Cite error: The named reference Marshall was invoked but never defined (see the help page).
  2. ^ HANDY, S., CAO, X. and MOKHTARIAN, P.L., 2005. Correlation or causality between the built environment and travel behavior? Evidence from Northern California. Transportation Research Part D: Transport and Environment, 10(6), pp. 427-444.
  3. ^ DFT, 2007. Manual for Streets. London: Thomas Telford Publishing. Paragraph 4.2.3