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Sigma KEE - SurfacedRoadway
KB Term: 

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浮出水面的巷道
SurfacedRoadway is the subclass of Roadways that have been improved by covering them with a substance to increase the hardness and smoothness of the surface. Covering materials include pavement, concrete, asphalt, macadam, and gravel.
Relationships      
Parents 巷道 Roadway is the subclass of LandTransitways that are areas intended for surface travel by self-powered, wheeled vehicles, excluding those that travel on tracks. Roadways have been at least minimally improved to enable the passage of vehicles. Roadways include dirt and gravelled roads, paved streets, and expressways.
Children 高速公路Expressway is the subclass of SurfacedRoadways that are multiple-lane, limited-access highways designed for rapid travel by MotorVehicles.


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