The connecting motorway on the Austrian side,
Nordost Autobahn A6 was opened on 19 November 2007. The highway connects the border with Slovakia to the
Ost Autobahn A4. It provided connection to 3rd of its 5 neighboring country. Until 2007,
Slovakia was connected by motorway only to the
Czech Republic and
Hungary. In 2016, the construction began of the
motorway section from the
D2x
D4 junction near
Jarovce to
Bratislava, Rača. All the section was set to open in 2020, which was delayed due to construction problems. Therefore, only the Bratislava, South - Bratislava, Podunajské Biskupice and the Bratislava, Podunajské Biskupice - Bratislava, Vrakuňa sections were opened in 2020. The rest of the section opened in the fall of 2021. However, the
D1/D4 junction has been delayed all the way to the year 2026. On 24 November 2024, the slip road at
Bratislava-vychod was put into operation, in the direction of
D1 towards Trnava.
Future developments Funded by a strategic investment, the
Bratislava-Rača –
Bratislava-Záhorská Bystrica section is planned for future construction, including the twin-bore
Karpaty tunnel at a length of . As of 2024, the planned construction start date is the fourth quarter of 2029 and the planned completion date is the second quarter of 2036. The
Karpaty tunnel would be the second longest of its type in Europe, and will take the new D4 motorway under the mountains. The tunnel will cost around €1-1.5bn. == Route description ==