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Each US state and Canadian province has its own regulation on dimming distance. However, most states specify that you must use low beams within 500 feet of an oncoming vehicle, and within 200 feet of a leading vehicle (travelling your same direction). These distances are quite outdated; they were specified when high beams were allowed to produce only less than half the present allowable maximum intensity, and have not been updated as headlamp regulations and technology have evolved. Technically and physiologically, distances more appropriate to today's North American-market headlamps are 700 feet for oncoming, 300 feet for leading vehicles. Nevertheless, if you adhere to 500/200, you will in most cases be meeting your legal obligation.

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