What is the meme of 'deceleration glass'? Why do two cars feel slow despite having the same speed?

Not long ago, my friend and I were driving out to play. At that time, we each had a walkie talkie and spoke very clearly. By chance, I asked him: What is your speed? He said it was 98, and when I saw that my speed was also 98, why did we both have the same speed and feel like he was so fast? At that time, my friend gave me an explanation, saying that there was a deceleration glass in my car, but I didn't see any difference in this glass. So when we were resting, I opened my phone and searched for this deceleration glass to see what kind of principle it was.

In fact, there is no such thing as deceleration glass. It is all based on human visual principles. For example, when we are on a plane, the plane slowly climbs. At this time, when we look at the ground, everything on the ground is very slow, even high-speed cars look very slow on the plane. However, when we are on a high-speed train and look outside, we feel that the speed is very fast. In fact, the speed of airplanes and high-speed trains is similar, only the distance between the eyes and the observed objects is different.

Let's go back to the aspect of cars. When we see large passenger cars and buses in our daily lives, we can observe this phenomenon by observing the glass. For large cars like these, the front windshield is almost vertical. This design is mainly for drivers to have a better view, making it easy to see the road conditions in front of the glass. Riding in these cars, you feel that the speed is very fast. Then, when we look at those small cars, the windshield is basically tilted, and the front of the car is much longer than that of large buses, so we can see that the distance to the ground is relatively far.

So this brings a different feeling to the visual perception, which is that the speed of the car is slowing down. When we see those sports cars, their cars are relatively long, but the feeling of driving will be very slow. So these things are just our feelings in our hearts. In fact, the speed is the same. After all, technology cannot deceive people. The odometer of a car displays very accurate numbers. Don't instinctively step on the accelerator just because of your visual problems, as this will increase the chance of accidents.