Seeing the name IIHS, many fans will never be unfamiliar. Its full name is the American Highway Safety Insurance Association. Every year, a large number of new car crash test reports are issued, which is less authoritative than the European E-NCAP organization. In fact, IIHS is not only concerned with the performance of cars after collision, but for all aspects of vehicle safety. Many of the current common security configurations are popularized under the supervision and promotion of institutions such as IIHS.
Now, IIHS is eyeing a new area that affects traffic safety: headlights, and released the industry's first evaluation report on car headlights. As a result of the raid test, all models are unprepared, and the result is a red, whether it is a luxury car or a grocery shopping cart, slaps a large piece.
Seeing this list is not surprisingly unexpected? Among the 31 models, only one Toyota Prius v, the luxury brands such as Mercedes-Benz and Cadillac, even failed to pass many models.
"If you can't see the road when you drive at night, then most of you can't blame your eyes, but you should blame the lights," said David Zuby, executive vice president and chief research officer of IIHS, which in itself implies another Meaning: The performance of headlights on most models today is not ideal.
Among the headlights mounted on these models, there are halogen lamps, xenon lamps, and LED headlights. However, regardless of the source, most of them are difficult to get the recognition of IIHS. What are the problems with these headlights? We must first look at the evaluation criteria of IIHS.
Compared with the crash test, the IIHS's evaluation of the performance of the headlights is much simpler. The test site is at the IIHS's own research center. After dark, the car is driven to the test road. The testers evaluate the headlight performance of each model item by item. The evaluation items mainly include the following:
1. Straight line; 2. Sharp turn to the left; 3. Sharp turn to the right; 4. Slow left turn; 5. Slow turn right.
In these five forms, the tester will evaluate the lighting of the headlights on the road ahead in the car. This test is whether the brightness and angle of the headlights are reasonable. On the other hand, the tester will also evaluate the big The glare caused by the lights on the opposite side of the car or pedestrians, if the glare is too strong, will also affect the headlights score.
(Note: the blue light in the picture is a low beam light and the white light is a high beam light)
In other words, there are three main benchmarks for the performance of headlights in the IIHS: brightness, glare and angle. When evaluating the brightness of the headlights, the IIHS uses the lux unit as the standard. To determine how far a headlight can be, it depends on the farthest object above 5 lux. For example, 1 lux is equivalent to the brightness of the full moon shining on the ground in cloudy weather. The brightness of 3 lux can make people distinguish objects with less obvious outlines. 5 lux is enough for the owner to distinguish the details of the road ahead.
Here we look at the different brightness conditions through two pictures.
(Mercedes-Benz C-class halogen headlights, score "poor")
(Honda Accord halogen headlights, rated "good")
The assessment of glare is well understood. Whether driving or walking, we are often plagued by the glare of the high beam in the evening. However, the glare of the IIHS test is not a high beam mode, but a low beam mode. It should be pointed out here that although many lights can be manually adjusted for high and low angles, some models are also equipped with automatic height adjustment function, but the IIHS test uses all the original settings when the vehicle is shipped, and the angle is not adjusted. This is because manufacturers do not recommend that the owner adjust the angle of the headlights themselves, and consumers generally do not adjust the lights themselves.
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