Key:parking:orientation

This feature has been labeled as deprecated. The recommended replacement is: orientation=*.
The reason is documented in Deprecated features. You are still free to continue to use or interpret this tag as you see fit since OpenStreetMap does not have “banned features”.
Under no circumstances should you (semi-)automatically change “deprecated” tags to something else in the database on a large scale without conforming to the automated edits code of conduct. Any such change will be reverted.

Indicates the orientation/direction of parked cars on a parking area in relation to the carriageway/traffic flow. In particular suitable for parking=street_side parking areas, and applicable to parking=lane as well (these will usually have the value parallel). This orientation value is equivalent to the corresponding values of the parking:lane=* scheme, which is used to indicate parking as a property of the highway=* ways (where parking areas are not mapped separately).

Valid values are:

Value	Image	Description
perpendicular		parking at right angle/orthogonal/90 degrees to the road/traffic flow
parallel		parallel to/same direction as the street/traffic flow
diagonal		angle parking, usually at an angle between 45 and 60 degrees