Cutting the corner leaves tri-drive truck, trailer and load at tipping point

Safety Alert Type: 
Log Hauling
Location: 
Farwell Canyon (west of Williams Lake, BC)
Date of Incident / Close Call: 
2013-12-12
Company Name: 
Westline Harvesting Ltd.
Details of Incident / Close Call: 

A loaded tri-drive truck with tridem hayrack trailer was travelling through Farwell Canyon, west of Williams Lake. The driver was ascending a hill and in the process of negotiating a sharp left hand corner (adverse switch back), when the trailer off-tracked over the inside edge of the roadway and upset. In turn, the passenger side tires of the truck were torqued into the air by the upset trailer and the truck ended up balanced on only its left side wheels.

The driver was not injured, but the truck and trailer sustained substantial damage. Further damage and/or injuries may have occurred had the truck tipped over completely or if this incident occurred at a higher speed.

Root Causes:

• The driver cut the corner and did not remain on the proper side of the roadway (lack of situational awareness, attempt to save time and effort).

• The driver failed to stop and reattempt the corner when the truck started to lose traction and slide to the inside of the corner, instead he attempted to power through the corner (attempt to save time and effort, failure to recognize hazard).

• The driver failed to monitor the position of his trailer and allowed it to off-track over the edge of the roadway (lack of situational awareness, attempt to save time and effort, failure to recognize hazard).

Learnings and Suggestions: 

• Workers are reminded that in an upset condition to take their time, thoroughly assess the hazard/risk of a situation and take appropriate corrective action(s).

• Drivers must remain on the proper side of the roadway and not cut corners.

• Drivers must know the location/position of their truck and trailer, and take trailer off-tracking into consideration.

• Drivers of tridem hayrack trailers need to pay special attention to the positioning of the trailer due to the excessive off-tracking associated with this configuration.

• If traction is at all in question, stop and put on tire chains prior to losing traction.

For more information on this submitted alert: 

For more information: Wayne Erlandson at (250) 392-2001

File attachments
Cutting the corner leaves tri-drive truck, trailer and load at tipping point.pdf
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