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Detects which links can not be used in curb approach mode (TTSPcurb), when U-turns are not allowed. The problematic links are marked with 1 in the IA array.
Simple CulDeSac links are not marked, since testing for CulDeSac can easily be done with calling CulDeSac for all links.
The function returns the number of elements set in the array.
The difference between the two functions, is this one also locates links where oneway restrictions are the cause of the problems.
Syntax: CulDeSacCurb(var IA: TIntegerArray): integer