When you build a road, the first result you get is a road just resting on the terrain: the level of the left and right nodes is calculated from the terrain itself.
You should use the Road Longitudinal Section Tool to assign the proper level to each node.
Otherwise, you can select the road object, double-click on the ArchiCAD object tool and use the provided parameters to "automatically" handle the levels on the two sides of the road (left=right or right=left).
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Fabrizio
Fabrizio Diodati
Graphisoft Italy Srl | Via Rossignago 2/A Spinea Venezia 30038 Italy