https://travelmapping.net/hb/showroute.php?r=srb.a005I traveled the entire A5 today. Long story short: OSM is right!
Long story: Coming from the south, I headed to the west of KruĊĦevac. I drove the whole city bypass (B23 in HB) and A5 up to A1. Traffic is already using the southern carriageway of the future A5 motorway except of a short detour at the interchange with road 183. The bypass is signed throughout as A5 signs are already (mostly) in place: On km posts, on direction signs (from i/c with road 183) and distance signs. The beginning / end of the motorway signs are at that "183 i/c".
The B23 section from where A5 in HB starts to the B38 is not existing anymore.
A5 is ending at the toll station just in front of A1. The 2nd c/w is missing at the toll station but there is no motorway gap.
Please update