Pan-European Corridor X
Pan-European Corridor X highlighted in red
Major junctions
Start end	Salzburg (Austria)
End end	Thessaloniki (Greece)
Location
Countries	Austria  Bulgaria  Croatia  Greece  Hungary  North Macedonia  Serbia  Slovenia
Highway system
Pan-European corridors

The Corridor X is one of the pan-European corridors. It runs between Salzburg in Austria and Thessaloniki in Greece. The corridor passes through Austria, Slovenia, Croatia, Serbia, North Macedonia, and Greece. It has four branches: Xa, Xb, Xc, and Xd.

The European Bank for Reconstruction and Development has given loans to support infrastructure improvements along Corridor X.^[1]

Branches

X: Salzburg - Ljubljana - Zagreb - Belgrade - Niš - Skopje - Veles - Thessaloniki.

• Branch A: Graz - Maribor - Zagreb
• Branch B: Budapest - Novi Sad - Belgrade
• Branch C: Niš - Sofia - Plovdiv - Edirne - Istanbul via Corridor IV
• Branch D: Veles - Prilep - Bitola - Florina - Igoumenitsa (Via Egnatia)

Branch A (Corridor Xa)

Corridor Xa runs between Graz, Austria and Zagreb, Croatia through Croatia, Slovenia, and Austria.

Branch C (Corridor Xc)

Corridor Xc follows the route Niš - Sofia - Plovdiv - Edirne - Istanbul.

The road in Serbia from Niš to the Bulgarian border nearby Dimitrovgrad is recently upgraded to a motorway standard. The construction works in all sections are completed on November 9, 2019.^[2]

In Bulgaria, I-8 road connect Sofia with the Serbian border, but Kalotina motorway is planned to supersede it. Currently the transit traffic has to pass via the Sofia Ring Road, but a new bypass Northern Speed Tangent is under construction since 2015^[3] and is expected to be completed in 2016. Trakia motorway (A1) runs from Sofia to Chirpan, where Maritsa motorway (A4), completed in October 2015,^[4] branches off to Turkey.

In Turkey, Otoyol 3 motorway runs from Edirne to Istanbul.