Filtered permeability is a term used to describe a network of streets where pedestrians and cyclists can move in any direction, but motorised traffic is restricted to access only. Other terms used to describe filtered permeability might include use of a fused grid (where connections are made between streets with pathways that are closed to motor traffic) or more colloquially, rat run blocking.
It is always important to note that filtered permeability is designed to slow down motor traffic and make streets open for access only rather than through running, and that filtered permeability is neutral in respect of car parking. For developments where the goal is to maximise availability of car parking spaces, filtered permeability can assist this, because one of the most prominent measures is to convert to way streets into one way running, thus freeing up space for car parking. Since filtered permeability measures significantly reduce the amount of fast moving through traffic, it can also become much easier to install parking spaces without having concerns over parking manoeuvres interrupting other vehicles.
Adopting a strategy of filtered permeability can add a significant amount of value to any development, because the streets become a great deal more attractive and liveable. I’ve spent a significant amount of time studying housing developments and local streets which have successfully implemented filtered permeability, both here in the UK, and in the Netherlands where the concept was first originated. I can help developers and local authorities understand how filtered permeability works, and implement the most relevant strategies for the local context.
If you would like more information about how filtered permeability can help with your development or road scheme, please use the contact form on the right.