From Wazeopedia

Overpasses, Underpasses and Bridges

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How overlapping roads are defined in Waze
==How overlapping roads are defined in Waze==
Waze has a value called Level which is assigned to every segment. By default, the Level of a segment is 0 "Ground" (equivalent to zero). When two segments overlap, the value of Level for each segment must be different. This ensures that the Waze problem detection system doesn't flag the spot where two segments overlap as a location where a junction might be needed.
==Creating an Overpass==