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Why only `hov=designated` and not all access tags, such as `hov:yes`, `hov=no` and so on? From the Wiki: - designated: The way is designated to high occupancy vehicles. - yes: High occupancy vehicles are allowed. This by itself does not imply that other vehicles are restricted from using the way. - no: High occupancy vehicles are not allowed on the way. This by itself does not imply that other vehicle types are allowed to use it. The primary use-case is conditionally filtering ways such as: http://www.openstreetmap.org/way/11198593#map=19/37.82571/-122.30521&layers=D In addition there is a notion of HOV lanes for lane handling: http://wiki.openstreetmap.org/wiki/Key:hov#hov:lanes.3D.2A This changeset does not handle lanes at all, only designated HOV ways. For HOV lane support, a logic similar to the lane access handling needs to be implemented. This needs to go hand in hand with the existing lane handling introduced in: https://github.com/Project-OSRM/osrm-backend/commit/7d076e93445a4d016422a575f1132b267cd13c29 References: - #2711 - http://wiki.openstreetmap.org/wiki/Key:access - http://wiki.openstreetmap.org/wiki/Key:hov#Values