Modal filter
'A modal filter is a feature used to limit through-journeys along a street by certain modes of transport. Modal filters are used to achieve filtered permeability and are part of the toolbox of low traffic neighbourhoods.
In a cycling context, the most pertinent type of 'filter' is one that limits access to just walking and cycling. This can be achieved in a variety of ways; either with just traffic sign restrictions (the 'flying motorbike'sign, prohibiting motor traffic, or an 'Except Cycles' plate on a 'No Entry' sign), or with physical restrictions such as bollards. Even a bus gate is a type of modal filter, allowing free passage by walking, cycling and buses, but prohibiting private motor traffic.
Modal filters can also be achieved very rapidly and cheaply, using concrete blocks or flower/tree planters, including as part of experimental traffic orders used to test changes before making them permanent.
Modal filters are sometimes also referred to as point closures, but we discourage use of terms like "closure" as it presents a motoring-centric view of streets, and can create needless worry for residents and businesses who may understand it to mean the street is being entirely closed to vehicles, when in fact modal filters do not prevent access to property by motor vehicle.'
Defintion from the Cycling Embassy of Great Britain
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