Create of pgr_separateTouching(edges SQL, tolerance, dryrun) - breaks the edges that touch each other or the dead end is very close to an edge
Example execution (using the Sample Data of the documentation):
SELECT seq, id, sub_id, ST_AsText(geom)
FROM pgr_separateTouching('SELECT id, geom FROM edges');
seq | id | sub_id | st_astext
-----+----+--------+------------------------------------
1 | 14 | 1 | LINESTRING(2 3,1.999999999999 3.5)
2 | 14 | 2 | LINESTRING(1.999999999999 3.5,2 4)
(2 rows)
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