When driving at night on an unlit road, you should switch from high-beam to low-beam headlights before reaching the crest of a hill or rounding a sharp curve, even before an oncoming vehicle becomes directly visible.
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True
The statement is True because high-beam headlights project forward and upward, meaning they will strike an oncoming driver's eyes over a hill crest or sharp curve before the vehicle itself can be seen. Preemptive dimming prevents glare hazards.
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Preemptive headlight dimming at hill crests and sharp curves to prevent glare