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Sigma KEE - TransitwayObstacle
KB Term: 
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TransitwayObstacle
TransitwayObstacle is the general class of Objects that can act as obstacles to Motion along a Transitway.
Relationships      
Parents objet Corresponds roughly to the class of ordinary objects. Examples include normal physical objects, geographical regions, and locations of Processes, the complement of Objects in the Physical class. In a 4D ontology, an Object is something whose spatiotemporal extent is thought of as dividing into spatial parts roughly parallel to the time-axis.
Children CanalLockGate
 DamDam is the subclass of StationaryArtifacts that are walls built across a stream or river to hold back water.
 DoorAn Artifact that restricts and permits access to a StationaryArtifact (e.g. Building or Room) depending on whether the Door is open or locked. Note that the class Door also covers gates, because it is not possible to define objective criteria that reliably distinguish doors from gates.


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