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Public-images-osm logo.svg two_sided = yes
Explicitly describes feature as two sided - applicable to for example guard rails Edit this description in the wiki page. Edit this description in the data item.
Group: properties
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasshould not be used on relations (except multipolygon relations)
Status: undefined

The two_sided key clarifies if a feature that is normally one-sided (that is, facing the right side of the way) is instead two-sided (facing both directions), such as barrier=city_wall or barrier=guard_rail (for example, when a guard rail is in-between opposite lanes). Another example is a two-sided barrier=kerb between lanes on a turbo roundabout.