According to the manual, what can cause headlights to become out of adjustment?
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A.
Vehicle vibration Correct
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B.
Long exposure to sunlight
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C.
Frequent use of high beams
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D.
Cold winter temperatures
The answer is "Vehicle vibration"
The manual says vehicle vibration can cause the headlights to become out of adjustment, which is why it recommends routinely checking and adjusting the aim. Drivers who pick D are carrying over the cold-weather checklist they use for tire pressure and battery output and assume the headlight mount drifts the same way.
The traps in the wrong answers
B. Long exposure to sunlight
Sunlight is not listed in the equipment section as a factor in headlight aim. This answer extends sun-damage reasoning for paint and dashboards to the mechanical mount holding the headlight.
C. Frequent use of high beams
The manual does not treat high-beam use as a factor in whether the aim drifts. This answer confuses how often a bulb switches on with the mechanical stability of the housing holding it.
D. Cold winter temperatures
Cold weather is not named as a cause; the manual points to vehicle vibration as what knocks the headlights out of adjustment. This answer carries over the winter checklist for tire pressure and battery output and assumes headlight aim drifts the same way.
This question tests your knowledge of Vehicle Equipment in North Carolina. Source: North Carolina Driver Handbook, "Vehicle Equipment - Lights," p.65..
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