Kerenzerberg Tunnel closed weekly in June
Closures of the Kerenzerberg Tunnel (A3)
Drivers in Switzerland will need to prepare for significant traffic restrictions on the A3 motorway in June 2026. The Kerenzerberg Tunnel will be completely closed on weekdays due to extensive repair work from 1 June to 26 June 2026. Travellers should therefore plan their route well in advance and factor in additional travel time.
Why are the closures taking place?
As the Federal Roads Office (FEDRO) announces, the closures are necessary to renovate the Escher Canal Bridge and carry out various demolition and concrete works inside the tunnel. The construction work therefore serves the long-term safety and functionality of the infrastructure. FEDRO is endeavouring to keep the impact on traffic as low as possible. During the construction phase, the Kerenzerberg Tunnel will remain closed from Sunday at 10:00 pm to Friday at 12:00 noon each week. At weekends, however, the tunnel can be used without restrictions.
What diversions are available?
Traffic will be diverted via the lakeside route along Lake Walen during the closure periods. As the diversion route operates with oncoming traffic, longer journey times and increased traffic volumes are to be expected, particularly during peak hours. Not only commuters are affected, but also holiday travellers and transit traffic heading towards Graubünden, Liechtenstein and Italy.
Tolls in Switzerland: The rules that apply to travellers
Anyone travelling on alternative routes through Switzerland during the closures should also familiarise themselves with the applicable toll regulations. The use of Swiss motorways is not governed by a distance-based car toll, but by the vignette obligation or the heavy vehicle charge. You can find detailed information on tolls in Switzerland in our guide.
Digital vignette for your journey
A valid Swiss annual vignette is required to use the motorways. You can conveniently purchase this digital vignette online from us. As a general rule, vehicles up to 3.5 t GVW (gross vehicle weight) require a vignette. Vehicles weighing more than 3.5 t GVW, on the other hand, are required to pay a heavy vehicle charge. In Switzerland, only an annual vignette is currently available. Therefore, no other validity periods are offered.
Heavy vehicle charge (LSVA and PSVA)
For motor vehicles weighing more than 3.5 t GVW, the heavy vehicle charge applies: either the Flat-Rate Heavy Vehicle Charge (PSVA) or the Performance-Related Heavy Vehicle Charge (LSVA). This charge must be paid at customs upon entry or in advance online via the Via portal.
Special toll
In addition to the vignette obligation and the heavy vehicle charge, Switzerland also has special toll routes. These are primarily tunnels and Alpine pass roads whose construction and maintenance are particularly cost-intensive due to the demanding Alpine conditions. An additional fee is charged for using these routes. The special toll must be paid independently of the vignette, meaning vehicle owners need a separate ticket or pass even with a valid annual vignette.
Car trains (vehicle transport trains)
Another special feature of the Swiss transport network is the car train. These enable the transportation of vehicles through mountain regions and tunnel sections that would otherwise only be accessible via lengthy detours. A separate ticket is required to use a car train. Especially in heavy traffic or difficult weather conditions, car trains represent a practical alternative for many travellers.
The Europamaut team wishes you a pleasant journey!
The weekly closures of the Kerenzerberg Tunnel will noticeably affect traffic on the A3 in June 2026. Anyone planning trips to eastern Switzerland, Graubünden or further towards Italy should take the diversions via the lakeside route into account and allow sufficient time for the journey.
With early route planning and the right toll products, unnecessary delays can be avoided. Our digital vignette offers a simple way to enjoy your journey through Switzerland in comfort. If you have any questions about toll regulations, our support team is available at any time by email.
