[sustran] Filtered permeability - World Streets

[eric britton]

We would very much like to do an article on the state of the art of
"filtered permeability" for World Streets.  IF you are strong n this area or
have a contact who is, it would be great to hear from you.
 
Here is how the entry in Wikipedia looked this morning:
 

Filtered permeability

Filtered permeability is the concept, supported by organisations such as
Sustrans <http://en.wikipedia.org/wiki/Sustrans> , that networks for walking
and cycling should be more permeable than the road network for motor
vehicles. This, it is argued will encourage walking and cycling by giving
them a more attractive environment free from traffic and a time and
convenience advantage over car driving. Evidence for this view comes from
European cities such as Freiburg <http://en.wikipedia.org/wiki/Freiburg> ,
and its rail suburb Vauban, and Groningen
<http://en.wikipedia.org/wiki/Groningen_%28city%29>  which have achieved
high levels of walking and cycling by following similar principles,
sometimes described as: "a coarse grain for cars and a fine grain for
cyclists and pedestrians".[5]
<http://en.wikipedia.org/wiki/Permeability_%28spatial_and_transport_planning
%29#cite_note-melia-4>  Filtered permeability requires cyclists, pedestrians
(and sometimes public transport) to be separated from private motor vehicles
in some places, although it can be combined with shared space
<http://en.wikipedia.org/wiki/Shared_space>  solutions, elsewhere in the
same town or city. This is the case in some Dutch towns such as Drachten
<http://en.wikipedia.org/wiki/Drachten> .
The principle of filtered permeability was endorsed for the first time in
British Government guidance for the eco-towns programme in 2008[6]
<http://en.wikipedia.org/wiki/Permeability_%28spatial_and_transport_planning
%29#cite_note-clg-5>  and later that year by an alliance of 70 organisations
concerned with public health, planning and transport in their policy
declaration: Take Action on Active Travel.[7]
<http://en.wikipedia.org/wiki/Permeability_%28spatial_and_transport_planning
%29#cite_note-adph-6> 
A parallel debate has been occurring in North America, where researchers
have proposed and applied the Fused Grid
<http://en.wikipedia.org/wiki/Fused_Grid> , an urban street network pattern
which follows the principles of filtered permeability, to address perceived
shortcomings of both the 'traditional' grid and more recent suburban street
layouts. A study conducted in Washington State[8]
<http://en.wikipedia.org/wiki/Permeability_%28spatial_and_transport_planning
%29#cite_note-frank-7>  found that the fused grid was associated with
significantly higher levels of walking than the other two alternatives. A
recent comparison of seven neighbourhood layouts found a 43 and 32 percent
increase in walking with respect to a conventional suburban and the
traditional grid in a Fused Grid <http://en.wikipedia.org/wiki/Fused_Grid>
layout, which has greater permeability for pedestrians than for cars due to
its inclusion of pedestrian-only paths (filtering). It also showed a 7 to 10
percent range of reduction in driving with respect to the remainder six
neighbourhood layouts in the set. [9]
<http://en.wikipedia.org/wiki/Permeability_%28spatial_and_transport_planning
%29#cite_note-8> 
 
Thank you.  Eric Britton
 
 
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