Villach, Austria – A new tunnel bore beneath the Karawanks mountain range officially opened on Wednesday, marking a significant step toward easing congestion on a vital transportation corridor between Austria, and Slovenia. The new eastbound tube of the Karawankentunnel, approximately eight kilometers (five miles) long, will gradually open to traffic beginning March 20th, with full two-way operation expected within a week. The project aims to eliminate the notorious bottlenecks that have plagued this key route, particularly during peak travel seasons.
For decades, the Karawankentunnel has served as a crucial link connecting Austria’s Karawanken Autobahn (A11) with Slovenia’s A2 motorway, providing access to Ljubljana and onward to Croatia and southeastern Europe. However, its single-tube configuration has long been a source of frustration for travelers, leading to lengthy delays and, at times, complete standstill traffic. The completion of the new tunnel is the first phase of a larger project to fully modernize the crossing.
Years in the Making, Challenges Overcome
Construction of the new tunnel began over seven years ago, but faced delays due to challenges on both the Austrian and Slovenian sides. According to project officials, Slovenia experienced difficulties with the tendering process, while the Austrian portion encountered complex hydrogeological conditions. Despite these hurdles, the Austrian section, built by ARGE Swietelsky Tunnelbau GmbH & Co KG and Swietelsky Baugesellschaft m.b.H., was structurally completed in autumn 2023. During excavation, approximately 1.5 million tons of rock were removed from the Austrian side alone.
The tunnel’s construction also incorporates sustainable practices. Water flowing from the mountains – around 600 liters per second – is harnessed to power a small hydroelectric plant, providing electricity for the tunnel’s operations.
Phased Transition and Future Improvements
Traffic will be gradually shifted to the new eastbound tube. Starting March 20th, northbound traffic will utilize the new tunnel. Shortly thereafter, traffic heading from Austria into Slovenia will also be redirected. For the next several years, traffic will flow in both directions within the new tube, mirroring the current configuration of the existing westbound tunnel.
The real transformation will reach with the comprehensive renovation of the original tunnel, slated for completion by 2029. Once the existing tube is modernized, the Karawankentunnel will operate with two dedicated lanes in each direction, significantly increasing capacity and improving traffic flow. The entire project, including the renovation, is estimated to cost around €570 million, with the European Union contributing €3.35 million for planning and €9.4 million for construction, according to project documents.
A History Marked by Conflict
The Karawankentunnel’s history extends beyond transportation. The existing westbound tube, originally constructed between 1986 and 1991, briefly became a site of conflict during the Ten-Day War in Slovenia in June 1991. Units of the Yugoslav People’s Army occupied the tunnel, and exchanges of fire occurred, with fighter jets targeting the southern portal. Slovenian Territorial Defence forces eventually regained control of the crossing after a few days.
Asfinag board member Hartwig Hufnagl emphasized the long-term benefits of the project, stating, “In a few years, this bottleneck between Austria and Slovenia will be a thing of the past. With the complete expansion, the traffic jams that have repeatedly occurred on this route – especially in summer – will end. The new tunnel tube, which we are opening today, is the first step towards that goal.”
The toll for using the Karawankentunnel currently stands at €9.00 for passenger vehicles and is not expected to change, excluding standard index adjustments.
The completion of the new Karawankentunnel represents a major infrastructure investment aimed at improving connectivity and easing travel between Austria and Slovenia. Motorists can expect a phased transition over the coming weeks as traffic is redirected and preparations are made for the full modernization of this vital Alpine crossing.
The next major milestone for the Karawankentunnel project is the commencement of the renovation of the existing westbound tube, scheduled to begin following the full integration of the new eastbound tunnel into regular traffic flow. Updates on the renovation schedule and potential traffic impacts will be available through Asfinag’s official channels.
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