I don’t agree with merging these carriageways on 13. janvāra iela.
According to OpenStreetMap principles (“map what is on the ground”), separation is not defined only by a physical barrier. In this case, the two directions are clearly separated by double solid lines, and traffic operates as two distinct carriageways.
Relevant guidance from the wiki:
OSM Wiki: Dual carriageway — dual carriageways should be mapped as separate ways when directions are divided and cannot be freely crossed.
OSM Wiki: oneway — each carriageway should be tagged with oneway=yes when traffic flows in a single direction.
OSM Wiki: Lanes — lane count alone does not justify merging if carriageways are operationally separated.
In this specific case:
The double solid line acts as a legal and functional barrier (crossing is prohibited).
Left turns and U-turns are not possible across the center line.
Traffic flow behaves identically to a dual carriageway.
Merging into a single highway=* with lanes=6 would introduce routing errors:
Incorrect turn possibilities (especially left turns and U-turns)
Misleading navigation instructions
Broken side-of-street logic for routing engines
This is not theoretical — many routing and delivery services (e.g. Wolt, Bolt) rely on correct carriageway separation. Merging would degrade real-world usability (wrong pickup/drop-off side, unsafe crossings, etc.).
Conclusion:
The current mapping as two separate carriageways (oneway=yes on each) correctly reflects both the legal restrictions and actual traffic behavior. There is no need for a physical barrier to justify this.