Seconds are what count, not metres: at high speeds you need to see clearly ahead in order to react in time to situations on the road. This is why the front headlights on the BMW 3 Series Sedan are controlled based on speed. When driving in the city, they are automatically reduced to provide optimal illumination of the road directly ahead and to avoid dazzling oncoming traffic. At higher speeds, the headlights are raised for a clearer view of the road ahead.
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