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Difficulty: HardBacking Safety Rules

Because convex mirrors provide a wider field of view along the sides and rear of a commercial motor vehicle, a driver should primarily rely on convex mirrors rather than flat mirrors to judge the closing clearance distance to a dock or obstacle while backing.

Answer: Answer

Answer

False
Convex mirrors provide a wide-angle field of view to help identify hazards in blind zones, but their curved glass distorts depth perception and makes objects appear smaller and farther away than they actually are. Consequently, standard commercial vehicle backing safety rules dictate that drivers must never rely on convex mirrors to judge closing clearance distances; flat mirrors, spotters, and direct visual checks (G.O.A.L.) must be utilized instead.

Step-by-Step Solution

1
Identify the optical properties and specific operational functions of flat and convex mirrors on commercial vehicles.
Flat mirrors provide a true 1:1 proportional scale suitable for judging distance, whereas convex mirrors provide a wide-angle field of view that shrinks images and makes objects appear farther away than their true physical position.
Safe backing requires selecting the correct mirror type for the specific task of distance estimation versus hazard detection.
2
Evaluate the safety hazard of using convex mirrors to gauge closing distance when reversing toward a fixed structure.
Relying on convex mirrors to judge distance leads to severe underestimation of proximity, causing the vehicle to strike the dock or barrier before the driver anticipates contact.
FMCSA guidelines explicitly caution drivers never to rely on convex mirrors for distance calculations.
3
Determine the accuracy of the statement based on commercial vehicle backing safety standards.
The statement is false because flat mirrors, not convex mirrors, must be used to judge closing distances.
Convex mirrors are limited to checking for the presence of clearance obstacles, not measuring depth.

Key Concept

Mirror selection and depth perception distortion during commercial vehicle backing
Estimated Time:1m 0s
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Topics

Backing Safety Rules

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