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When you run Feature To Line you effectively break the drivability of the network by forcing junctions and bridges, overpasses, etc. This allows drivers to "turn" off a bridge or overpass onto the road below and dropping/crashing. Do you know of any way around this? Create a network from OSM but retain roads that cross over other roads (preventing turns at cross-over)?
OSM has a "layer" tag, which indicates the effective level of the roadway. You should be able to use that to inform your splitting function.
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