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Headlight flashing might have come into more common use as a means of attempting driver-to-driver communication by the mid-1970s, [3] when cars began to come with headlight beam selectors located on the steering column—typically activated by pulling the turn signal stalk—rather than the previous foot-operated pushbutton switches.
Flashing headlights is one way drivers communicate with each other to signal hazards ahead or police in the area enforcing speed limits. ... you must lower them when you are within 500 feet of ...
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A dim-dip device operates the dipped beam headlights at between 10% and 20% of normal low-beam intensity. Running lights permitted as an alternative to dim-dip were required to emit at least 200 candela straight ahead, and no more than 800 candela in any direction.
Formal research found, at best, a small improvement in visual acuity with yellow rather than white headlights, [55] [56] and French automaker Peugeot estimated that white headlamps produce 20 to 30 percent more light—though without explaining why this estimate was larger than the 15% to 18% value measured in formal research—and wanted ...
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In some cars, the windshield is fillet with the roof-line with a big radius. A fillet round A-pillar can give a tall driver visibility problems. Also sometimes the A-pillar can block the driver from seeing motorcyclists. Also, the B-pillar can block the vision of a tall driver in small 4-door cars. Turning your head reduces blind spot
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