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Conduit flows traffic through one or many Unidirectional Lane
Unidirectional Lane is a partial flow of traffic in one Conduit
By definition, a Conduit is a flow of traffic in one direction. It is a collection of adjacent Unidirectional Lanes all flowing traffic in the same direction.
Formalization
Unidirectional Lane.(Conduit role, Road segment) -> Conduit.(Role, Road segment)