Why are the front windshields of automobiles installed obliquely instead of vertically? Is it just because the oblique installation broadens the viewing angle, obviously reduces the wind resistance and makes the body beautiful? In fact, from the perspective of driving safety, inclined installation also plays an important role, which contains basic optical principles.
1.windage
We know that a large part of the car design is to overcome the influence of wind resistance, because when the car travels to a certain speed, if the wind resistance is too large, it will not only affect the power of the car, but also increase the fuel consumption of the car, and the inclined front windshield and streamlined body design exist to reduce the wind resistance.
2. Driving safety
When driving at night, if the lights are turned on in the car, the virtual shadow reflected by the vertical glass will be on the road, which will inevitably cause some interference to the driver. If it is inclined, the virtual shadow will be reflected on the high side, which will give the driver a good judgment ability. Secondly, if the glass is vertical, the light shining on the driver will be reflected vertically, which will affect the driving safety. On the contrary, the inclined front windshield will make the light reflect higher.
The front windshield of the cart is designed to be vertical, because the driver's position of a large vehicle will be relatively high, and the driver's line of sight is actually biased downwards when he sees the road, so even if the virtual shadow or reflection is in front, it will not cause too much influence on the cart, so the glass of the cart is different from the inclined shape of a small car.
In a word, installing the windshield vertically is not conducive to the night driving of the car. The windshield is installed obliquely to prevent all kinds of reflected light from reflecting into the driver's field of vision, thus greatly improving the safety performance of driving at night. The height of the headlights of all cars is roughly the same from the ground, while the body of a big car is higher, and the driver and the front windshield are also relatively high. Even if the windshield is made vertical, the light reflected by the front windshield of the big car will not be reflected to the eyes of the other driver, but will be in front of the driver. The high beam of a car lamp is parallel light which is almost parallel to the ground. The greater the angle of deviation from the parallel ground, the weaker the light intensity. Moreover, due to the structure of the rear window of a big car and the high height of the front windshield, the lights on the rear car generally do not form a bright virtual image through the vertically installed windshield of the car and are reflected in the driver's field of vision at the same time.
