A modal filter, sometimes referred to as a point closure, [1] is a road design that restricts the passage of certain types of vehicle in road transport. Modal filtering is often used to help create a low traffic neighbourhood (LTN), where motor traffic is diverted away from residential streets [2] [3] and instead toward feeder roads. Modal filters can be used to achieve filtered permeability within a transport network, [4] [5] [6] and can encourage walking and cycling through more pleasant environments and improved safety. [7]
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Modal filters can be implemented through the use of barriers such as bollards, boom barriers and planters, though filters can also be implemented virtually through the use of automatic number-plate recognition cameras and road signs, which can allow residential motor access while prohibiting passing motor traffic. [4]
Modal filters are often the result of circulation plans by local governments.
