You're driving at night. Within what distance of an oncoming vehicle must you switch to low-beam headlights?

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Correct answer: B. Within 150 metres

Use your low-beam headlights within 150 metres of an oncoming vehicle, or when following another vehicle within 60 metres — close enough that your high beams would otherwise blind the other driver.

Source: MTO Driver's Handbook: Driving at night and in bad weather — Headlights

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