R2

R2 / 1:1

Two Way Road Segment has forward flow of traffic defined by one Forward Paired Conduit

Forward Paired Conduit defines forward flow of traffic on one Two Way Road Segment

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By itself, a Two Road Segment is just a strip of pavement, maybe with a Median in the center. The Forward Paired Conduit is the rule that all traffic must flow in one direction within one or more adjacent Lanes. So we are pairing a physical structure (the Road Segment) with a policy (Conduit).

The assignment of forward and reverse depends on the location of the Ego Vehicle. See the Forward Paired Conduit class description for a more detailed explanation.

Formalization

Forward Paired Conduit.Road segment -> Two Way Road Segment.ID