How far ahead should you scan the road as you drive?
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A.
As far as your headlights reach at night
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B.
At least 10 seconds ahead of your vehicle Correct
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C.
To the next visible intersection or turn
The answer is "At least 10 seconds ahead of your vehicle"
The California manual sets 10 seconds as the minimum scanning distance so you have time to spot hazards ahead. Choice A tempts drivers who equate safe scanning with what their headlights actually light up at night; at highway speed the beams fall well short of 10 seconds, and the manual pins the rule to a time count, not a lit distance.
The traps in the wrong answers
A. As far as your headlights reach at night
Headlight reach falls well short of 10 seconds at highway speed, so it cannot serve as the scanning standard. This answer substitutes what the beams light up for the time-based rule, a habit that shrinks the safety margin as speed rises.
C. To the next visible intersection or turn
The manual uses a time-based standard, not a landmark, so distance to the next intersection is not the rule. This answer reaches for a visual landmark drivers already track, when the manual's rule is a seconds count, not a place count.
This question tests your knowledge of Defensive Driving in California. Source: California Driver Manual, "Be Aware of Your Surroundings," p.57..
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