Recent investigations into two fatal accidents in the Wislentunnel near Worb have concluded that human factors, not tunnel safety deficiencies, were responsible. These findings emerge after detailed analysis of police reports and widespread public concern about the tunnel's safety.
Key Takeaways
- Two fatal accidents in the Wislentunnel were caused by human factors.
- One accident resulted from a weakness, the other from falling asleep.
- Police investigations found no link between the two incidents.
- A safety inspection confirmed no significant defects in the tunnel.
- Driver condition contributes to nearly a quarter of all accidents in the canton.
Investigations Conclude Human Factors at Fault
On April 1 and May 13, 2025, the Wislentunnel experienced two severe head-on collisions. These incidents led many to question the safety of the 460-meter tunnel. Authorities launched a thorough investigation to determine the exact causes.
Lukas Bähler, head of the Traffic Technology and Safety department at the cantonal civil engineering office, confirmed the results of the investigation. He stated that the accident protocols have been evaluated and investigations are complete. The findings clearly show no connection between the two separate incidents.
Accident Statistics
- First accident: April 1, 2025
- Second accident: May 13, 2025
- Tunnel Length: 460 meters
No Safety Defects Found in Wislentunnel
Initially, there was speculation that the tunnel itself might have safety issues. However, the police reports and subsequent inspections have dismissed these concerns. The Wislentunnel played no role in causing either accident.
According to Mr. Bähler, the cantonal police forwarded only the first case to the public prosecutor's office. This procedure was later closed following the death of the driver suspected of causing the initial accident. Both investigations are now concluded, confirming the absence of a safety problem within the Wislentunnel.
"The investigations are complete, and they clearly show that there is no safety problem in the Wislentunnel," said Lukas Bähler.
Specific Causes of Each Fatal Collision
The first accident in early April involved a driver who reportedly experienced a weakness and swerved into oncoming traffic. The passenger in that vehicle died at the scene. The driver passed away approximately two weeks later in the hospital.
The second collision, which occurred in mid-May, was attributed to fatigue or falling asleep at the wheel. One driver died in this incident, and three other individuals, including the driver of the second car, sustained injuries, some severe.
Human Error in Accidents
Driver condition is a significant factor in road safety. Factors like fatigue, distraction, illness, or impairment can drastically reduce reaction times and decision-making abilities, leading to dangerous situations on the road.
Driver Condition a Major Factor in Cantonal Accidents
The canton's accident statistics highlight a broader issue. Mr. Bähler noted that the condition of the driver is the cause in 22 percent of all accidents recorded in the canton. This category includes a range of human factors such as:
- Influence of alcohol or medication
- Severe fatigue
- Driver distraction
- Sudden weakness or illness
These figures underscore the importance of driver awareness and responsible behavior behind the wheel. The human element remains a critical component in road safety across the region.
Public Perception and Tunnel Safety Inspections
Despite the official findings, some residents around Worb have expressed unease about the tunnel. Anecdotal evidence suggests some drivers have avoided the Wislentunnel since the accidents. This perception is not uncommon; a survey conducted by the German testing organization DEKRA years ago revealed that nearly half of all drivers, 46 percent, experience fear either "always" or "sometimes" when driving through tunnels.
To address public concerns and ensure comprehensive safety, the Wislentunnel, its bypass road, and the two roundabouts underwent a thorough safety inspection. This inspection occurred even though the accident protocols did not suggest any inherent safety defects.
The inspection results further reinforced the initial findings. Mr. Bähler confirmed that the inspection also identified no significant defects in the tunnel infrastructure. This should provide reassurance to the public regarding the structural integrity and operational safety of the Wislentunnel.




