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Alberta Class 7 Practice Test
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Passing target: 83.3% (25/30)
Trailer TowingStandalone practice
When must you use extension mirrors to tow a trailer?
An enlarged ordinary side mirror on a blue towing vehicle.
Correct answer: When the trailer is wider than the towing vehicle
Why
Alberta's guide requires extension mirrors when the trailer is wider than the towing vehicle. Adjust the mirrors before travel so that you can clearly see traffic that approaches from behind on both sides.
Verified against Driver's Guide - Cars and Light Trucks · Towing a Trailer · p. 122
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