Tag:oneway=yes

oneway = 
Description
One-way traffic in the direction indicated on the map. Show/edit corresponding data item.
Rendering in OSM Carto
Group: restrictions
Used on these elements
should not be used on nodesmay be used on waysshould not be used on areasmay be used on relations
Status: de facto

One-way traffic in the direction indicated on the map. See also oneway=* for more details.