Tag:placement=transition
 placement = transition
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| Description |
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Used to indicate that the OSM-way is neither in the middle of the whole road nor does it run parallel to some lane.  
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| Group: properties |
| Used on these elements |
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| Useful combination |
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placement:start=* and placement:end=* were mentioned in the original proposal as an alternative tagging scheme to placement=transition |
| Status: in use |
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The proposed tag placement=transition can be used to indicate that the OSM-way is neither in the middle of the whole road nor that it runs parallel to some lane. This value is usually only necessary if the road forks or joins with another one.
Tagging
A good example would be a freeway exit. Start the way segment that is in transition where it departs from the highway at the painted gore, end it at the start of the physical separation. This is visualized in JOSM as the selected (red) segment in Example 1. This may result in a steep angle: This is definitely a compromise between aesthetic consideration and what data consumers need to provide road users with navigation that accurately reflects decision points.
Original Proposal
See the proposal for details.
See also
placement:start=* and placement:end=* were mentioned in the original proposal as an alternative tagging scheme to placement=transition.