Hello Sandalss,
 Thank you for your quick response
This is a link to a wiki page that explains how to use the classification for links
see:https://wiki.openstreetmap.org/wiki/Highway_link
Therefore, when the road has branches, it is preferable for them to be of the same classification as the main road, so that the road classifications are consistent with the road network.
Examples :
https://www.openstreetmap.org/way 333615073
https://www.openstreetmap.org/way 982878313
https://www.openstreetmap.org/way 1012680223
While we use links when it is a transition from one street to another (connecting two streets )
Examples :
https://www.openstreetmap.org/way 982878311
https://www.openstreetmap.org/way 982878312
For these reasons, all streets were modified, such as the one mentioned above.
Happy to connect with you
Regards,
Merna_mahmoud