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This method finds where 2 links intersect and add these locations to LL (LL is not cleared first). Two entries are added every time, one for each link.
There should only be overpasses, where there is also a bridge / tunnel in real life.
You can call ExportLinks afterwards if you want to split the links where an overpass was found.
The FindOverPasses algorithm makes sure that exactly the same coordinates are used for both pairs of links, so snap is guaranteed if you call TImport on the resulting output from ExportLinks. See also SplitAndSnap.
Syntax: FindOverPasses(LL: TLocationList)
In standard version you are limited to networks with <10000 links.