Hello Sandalss,
Thank you for your contribution to OpenStreetMap in Oman.
I noticed you added a tag (ref=D320) for some streets.
Here are examples of those roads:
https://www.openstreetmap.org/way/284159717
https://www.openstreetmap.org/way/746786029
https://www.openstreetmap.org/way/506500593
It is not compatible according to our latest document
https://mjla.gov.om/decisions/ar/1071/show/1188
Do you have any sources confirming that? If you do, please share those sources with me.
Regards,
Merna_mahmoud