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Flow Separator physically separates opposing traffic flow in one Two Way Road Segment

[Two Way Road Segment* has opposing traffic flow separated physically by zero, one or many [Flow Separator

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A Flow Separator exists between opposing traffic when there is some kind of visual or physical barrier significantly wider than a painted line. This barrier is either a Median which may or may not be physically traversable or it is a Center Turn Lane.

Multiple different Flow Separators may be observed simultaneously on the same Two Way Road Segment. For example, an island Median may narrow to a single striped line and then widen back out to another Median without any intervening Intersection. Or, see Flow Separator for an example where a Median is situated between two Center Turn Lanes on the same Two Way Road Segment.

When there is nothing more than a striped line in between two opposing flows of traffic, there is no real physical Flow Separator.

Formalization

Flow Separator.Road segment -> Two Way Road Segment.ID