Modal filter

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] 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.