Query for Road Segments Along a Route

I am playing around with how to get a DL query to return the set of
nodes that would need to be visited in order to get from point A to
point B.  My map is notionally laid out according to the OntoGraf
picture below.  I've also shown how I documented the nodes, road
segments and intersections between road segments.

I can ask the question: "RoadSegment and RoadAttaches some Tarmac", and
it properly returns S01 as the road segment.  Is this now an iterative
problem to be solved in software, or do I need more information in my
semantic graph, or do I need a different query?

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