Hello Desertivy,  
I suppose you are relying on this source for your edits, right?  
https://wiki.openstreetmap.org/wiki/Iraq#Highway/Roads_classification_in_Iraq  
If so, please keep in mind that those classifications are proposed and were never approved or voted on by OSM members or the community, similar to the administrative levels mentioned under that section in the same link . Therefore, we should use the tag's values wiki and see what it says:  
  
https://wiki.openstreetmap.org/wiki/Key:highway#Highway  
https://wiki.openstreetmap.org/wiki/Tag:highway=primary  
https://wiki.openstreetmap.org/wiki/Tag:highway=secondary  
  
Keep in mind that in Iraq, we use the "النظام الانكليزي" (The English System) of road classifications and signs. You can see how the UK classifies its roads here:  
https://wiki.openstreetmap.org/wiki/International_highway_classification_equivalence#:~:text=United-,Kingdom  
  
In addition to that, I believe the ones you changed to primary it is not suitable for the situation on the ground. The main roads in this area of Baghdad are generally oriented from the southwest to the northeast, and the ones that cross them are narrower, have lower speed limits, and are less relevant and less used. Therefore, they should not have the same value, in my opinion. You changed almost all the secondary roads in Baghdad to primary, and I think we might need to reclassify those roads again.  
  
Tell me your thoughts.  
  
Regards.  