OpenStreetMap/tag

Proposals versus usage

As of 2013-06-05:

http://wiki.openstreetmap.org/wiki/Proposed_features/Incline 
Status: Rejected (inactive)

But 85000 objects use the Key:

http://taginfo.openstreetmap.org/keys/incline

As of 2025-11-01:

1 569 075 objects 
Objects with this key were last edited by 73 094 different users.