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On the morning of Friday, 19 October 2012 on Fv 115, a trailer truck started to slide sideways in a right curve. The rear of the semi-trailer moved into the opposite lane, colliding with an oncoming passenger car. The driver and the passenger in the passenger car were seriously injured.

AIBN's investigation of the accident found several faults with the breaking system. Theese faults were, in the AIBN's assessment, contributing factors to the semi-trailer sliding into the opposing lane.

AIBN has made a safety recommendation as a result of the investigation.

Safety recommendation

Safety recommendation ROAD no. 2013/12T

The investigation of the trailer truck accident on Fv 115 near Hjellebøl showed that there was a contact fault in the connection between the truck and the semi-trailer, as well as in several connections on the semi-trailer's electrical wires/signal cables to the control unit for the EBS system. This resulted in both the ABS and ALB system being disabled and contributed to the semi-trailer losing traction. There were no warnings on the driver's display panel which informed the driver of the real faults in the braking system, only information that the trailer did not have ABS brakes. Based on this and previous investigations, the AIBN believes that such faults on trailers are safety-critical.

The Accident Investigation Board Norway recommends that the Norwegian Public Roads Administration follow up the issues of lack of warning and loss of ABS and ALB capability in connection with loss of power/contact faults on trailers.


Fv 115 Hjellebøl, Akershus
Occurrence date
Accident type
Head-on collision
Road class
County road
Police Disctrict
Vehicle type
Passenger car, Truck and trailer
Type of Transportation
Freight transport
Road region
Eastern Region
Accident category
Ulykke m/ kjøretøy over 7500 kg
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