Motorists traveling the critical artery between eastern and western Slovakia are facing a challenging May as two major infrastructure projects converge to create significant bottlenecks. The Národná diaľničná spoločnosť (NDS) is planning a complete shutdown of the Višňové tunnel, the longest motorway tunnel in the country, forcing all traffic back onto the narrow, precarious road beneath Strečno castle.
This diversion is particularly problematic because the alternative route is currently undergoing its own extensive repairs. The Slovak Road Administration (SSC) is in the midst of stabilizing a slope in the Strečno gorge, a project necessitated by a significant road collapse in 2023. The combination of a total tunnel closure and a restricted-lane detour is expected to create severe delays for commuters and long-haul transport alike.
The planned closure of the Višňové tunnel is not an emergency repair but a scheduled spring maintenance cycle. NDS technicians must clean the internal spaces and clear the complex drainage systems to ensure the tunnel remains operational. Because of the sheer scale of the facility and the volume of technological equipment involved, the shutdown is more time-consuming and technically demanding than standard maintenance in smaller tunnels.
While NDS has not yet issued a definitive official announcement, the probable window for the closure in both directions is from May 4 to May 17. Yet, this timeline remains fluid. According to NDS spokesperson Tomáš Ferenčák, the dates are subject to change based on weather conditions, as several critical pieces of technology located in the exterior cannot be serviced during rainfall.
The Logistics of the Višňové Shutdown
The maintenance of the Višňové tunnel follows a strict semi-annual rhythm, with comprehensive service windows occurring every spring and autumn. The complexity of this specific site means the shutdown will likely last ten days or more.
„Čo sa týka samotnej organizácie uzávierky, bude dlhšia, no súvisí to predovšetkým s tým, že ide o najdlhší diaľničný tunel na Slovensku, čo so sebou prináša aj množstvo technologického vybavenia. Preto je servis technicky aj časovo náročnejší než v iných tuneloch,“
The uncertainty regarding the exact start date means drivers should monitor official channels closely. NDS typically confirms the final schedule only a few days before the work begins to avoid unnecessary disruptions if the weather forces a postponement.
Stabilizing the Strečno Gorge
As traffic is diverted away from the motorway, it will funnel into the Strečnianskej úžine, where the Slovenská správa ciest (SSC) is fighting to prevent further road degradation. The area suffered a collapse in 2023 due to unstable ground and the relentless pressure of heavy traffic. Since then, the originally three-lane road has been restricted to just two lanes.
The current solution involves the construction of a specialized anchoring threshold (kotvený prah) designed to reinforce the critical section of the road. The project, which began on April 8, is being executed by Swietelsky-Slovakia under a contract valued at nearly 916,000 euros. This engineering effort is extensive, involving the removal of existing road layers and the installation of micropiles and inclined anchors beneath the surface.
The work is being carried out seven days a week to expedite the process, though the final completion of the stabilization and the laying of new asphalt layers are not expected until August 2026. For now, the construction site is separated by concrete barriers, and traffic continues to flow in two narrowed lanes at reduced speeds.
Key Project Details: Strečno Slope Sanation
| Detail | Specification |
|---|---|
| Contractor | Swietelsky-Slovakia |
| Project Cost | Approx. 916,000 EUR |
| Start Date | April 8, 2024 |
| Estimated Completion | August 2026 |
| Current Status | Active (200m section) |
Navigating the Bottlenecks: Alternative Routes
With the Višňové tunnel closed and the Strečno route restricted, the “critical May” window will likely observe a surge in congestion. For those looking to avoid the area entirely, the options depend heavily on the type of vehicle being driven.
- Personal Vehicles: Drivers can utilize a detour via Terchová and Zázrivá. This route is strictly reserved for passenger cars and is not suitable for larger vehicles.
- Heavy Transport and Freight: Trucks and heavy machinery must use the route through the Rajecká valley and the Fačkov mountain pass, which is the only viable alternative for oversized cargo.
The Slovak Road Administration’s spokesperson, Jana Lukáčová, noted that while the impact of the ongoing slope work on traffic should be minimal under normal circumstances, the added volume from the tunnel closure will inevitably lead to increased delays.
The situation highlights the fragility of the east-west connection in this region, where a single maintenance window on a modern tunnel forces thousands of vehicles back onto an aging, unstable road network that is still struggling to recover from previous geological failures.
The next confirmed checkpoint for motorists will be the official announcement from NDS regarding the definitive start date of the Višňové tunnel maintenance, expected shortly before May 4. Drivers are encouraged to plan journeys accordingly and allow for significant extra travel time.
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