It follow the standard ArchiCAD logic about overlapping elements:
you can use the tab key to switch between the several overlapping elements selection or, activate the ArchiCAD object tool (Road and Plateau are objects!) to give "priority" to the object selection...
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Fabrizio
Fabrizio Diodati
Graphisoft Italy Srl | Via Rossignago 2/A Spinea Venezia 30038 Italy