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Why should your mirrors be adjusted to show the road behind you as well as part of your vehicle?

A Having part of the truck in the mirrors serves as a point of reference
Explaination
Part of your vehicle should be visible in your mirrors so that you have a point of reference when judging how close other drivers and objects are to your vehicle.
B Having only the road in the mirrors would likely make the driver carsick
C It is illegal to have only the road in the mirrors
D The driver should be able to see the reflection of surrounding vehicles on the trailer