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This will identify neighbouring links and join them in groups. The grouping can be defined by setting 3 parameters, where at least one of them need to be <> "ignore":
0: Ignore it
2: Intersection to intersection (intersection: Node with degree >= 3)
3: Intersection to intersection, but ignoring cul-de-sac links
0: Ignore roadname
N: Split when roadname changes
False: Ignore attributes
True: Split according to attributes
Result is stored in IA array: Indices with the same value belong to the same group.
Result can also be written to a TGISwrite output, if filename is specified. If GF = gfArray, just set filename to something.
Using parameter combination (0,0,false) is not allowed, since it would join ALL links into one large object.
When using topology=2, joins that would result in loops, are avoided.
Normally it used with these parameters, when the output is to be used for routing:
Topology = 2
RoadfileID >0, if the network is to be used with driving directions.
Attributes = true.
If turn restrictions are defined, they are exported to a file with ".turn" as extension with the updated link ID's as reference.