|junction = filter|
|A special type of junction|
|Used on these elements|
|Tools for this tag|
A filter or filter-in-turn is a type of junction that assigns priority to junction users based on the order in which they arrive at the junction. It is usually combined with a box junction so users of the junction must not enter the junction unless their exit is clear.
The filter is in common use on the island of Guernsey: http://www.gov.gg/ccm/navigation/travel-transport/visitors---new-residents/ (archived from the original).
In the U.S., this is called an 'uncontrolled intersection' and is functionally equivalent to an all-way yield.
This tag appears to be used at nodes where multiple highway=* lines representing roads intersect.