In postgis ST_Node should break a series of lines at intersections, which should solve the non-noded intersection problem. Wrapping this in ST_Dump generates the composite array of the broken lines.

Slightly related, there's an awesome presentation (PostGIS Power) out there which clearly outlines these sort of problems and solutions.

In postgis ST_Node should break a series of lines at intersections, which should solve the non-noded intersection problem. Wrapping this in ST_Dump generates the composite array of the broken lines.

Slightly related, there's an awesome presentation PostGIS: Tips for Power Users which clearly outlines these sort of problems and solutions.