Qazaqstan is going to switch to Latin alphabet. You should adapt all the road signs in your map.

Solaris Bus&Coach factory is missing.

Just as they curve motorways to avoid overspeeding IRL.

They overlap only partially. East of Belgrade is not covered by Project Balkans.

I explained three pages ago why this cannot be done.

GRA1 will not be needed in game after GRA2 has been completed.

Do you plan to add Croatian Adriatic islands?

Turkey: PO, Shell, Opet, BP, TPAO, LUKOIL, Aytemiz

Yes, special cargo follows a pre-arranged route just like IRL.
Cargo ideas: Locomotives, Airbus A380 body, large windmill, large pipe, mining truck

The motorway is made for E80. Therefore it may be added.

They do if it there is no shorter way. However, all rest stops need to be pre-arranged as not all rest areas are suitable. Sometimes, they just rest by the roadside (this is allowed unlike regular road hauls, again needs to be pre-arranged).