Directed route, segment used in both directions

What is the prefered method to add segments that are used in both directions for a route that is directed?

I ask this in the context of hiking routes that are signposted in only one direction. Often they have a layout where a small part of the route passes a segment in both directions. Typical examples are drawn below, where the red dot is the start and finish point

Normally you would add all segments with the forward and backward roles as necessary, bu what is the preferred method to add the two-way parts to the relation? I see two options:

• Add the two-way segments without a role
• Add the two-way segments twice: once with role forward and once with role backward

Advantage that I see with this second option: allows easy sorting to create a GPX track in one piece, thus matching how a user would move over such a route. Disadvantage: it feels somehow wrong to add a segment twice to the same relation.

Are there any guidelines what is the preferred option to map this situation?