You are driving with high beams on and see an oncoming vehicle in the distance. At what distance from that vehicle does the manual require you to switch to low beams?
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A.
When the approaching vehicle first becomes visible on the horizon.
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B.
Within 300 feet, the same as the close-following rule.
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C.
Only if the other driver flashes their lights at you first.
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D.
Within 500 feet of the approaching vehicle. Correct
The answer is "Within 500 feet of the approaching vehicle."
The manual sets the switch to low beams within 500 feet of an approaching vehicle. Option B is the trap; it swaps in the 300-foot figure from the close-following bullet printed immediately below in the same list.
The traps in the wrong answers
A. When the approaching vehicle first becomes visible on the horizon.
The manual specifies a 500-foot threshold, not a first-sight trigger from farther away. This answer errs on the courteous side, treating any glimpse of another driver as reason to dim rather than reading the specific figure.
B. Within 300 feet, the same as the close-following rule.
The 300-foot figure applies to following another vehicle, not to oncoming traffic. This answer applies the close-following number to oncoming vehicles, blending two bullets from the same low-beam list.
C. Only if the other driver flashes their lights at you first.
The requirement is a fixed distance, not a response to another driver's flash. This answer treats dimming as a courtesy signal exchange, borrowing a common flashing-headlights convention the manual does not codify.
This question tests your knowledge of Adverse Conditions in Texas. Source: Texas Driver Manual, "Chapter 9: Some Special Driving Situations - Headlights," p.47..
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