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if you are driving with your high beam lights on you must dim them at least 500 ft from any oncoming vehicle so you don t blind the oncoming driver you must use low beam lights if you are within 200 300 ft of the vehicle you are following consult your state s drivers handbook for details if an approaching car is using its high beams don t look directly into the oncoming headlights look toward the right edge of your lane
If over 50 meters / 164 ft length, then a second masthead light aft and higher than the forward one must also be carried. On vessels between 12 and 20 metres / 39 and 66 ft in length, the a masthead light, should be visible for 3 miles. Sidelights and stern light should be visible over 2 miles. For vessels of 50 meters / 164 ft the masthead light should be visible 6 nautical miles away and the sidelights and stern-light visible 3 miles away.