The following is from B.C. Motor Vehicle Act:
Where a trailer or semitrailer in a combination of vehicles diminishes the driver's reflected rear view through the rear view mirrors required by subsections (1) to (3), the towing vehicle in the combination of vehicles shall be equipped with 2 mirrors, one affixed to each side of the motor vehicle, and each to provide the driver with an undistorted reflected view of the adjacent lane of the highway from a point on the road surface 11 m ( 36' ) behind the driver to a point on the road surface 61 m ( 200' ) from the rear of the combination of vehicles.
Note that it says adjacent lanes, not the lane you are in ( directly behind the trailer ).
You'll find similar requirements throughout the US and Canada.
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What happens to the hole when the cheese is gone?
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