我来说说老外开车习惯

[南岸]

那种反光镜有卖的。我买过一个车内后视镜，用过一次就取下来了，没再用过。

没产生错觉？把自己搞晕了。

 

[ccc]

没产生错觉？把自己搞晕了。

好像在船上的感觉。

 

[ottawa_tj]

国内的镜子是凸镜，所以基本上没什么盲点，不用shoulder check。这儿的镜子都是平面，盲区必须shoulder check才能看见。
我觉得这儿的人起步快，是因为车好，动之前也会查看路面情况的。您的车3000转都跟不上大流，我的车2000多转可能就把所有的车甩后面了。这里双面红灯是3s等待，加上这里黄灯的规则与国内不同，是能停必须停，所以很安全。

你确定国内的镜子是凸镜吗？有多凸？凸到可以取代shoulder check？

这的车的镜子也是有点儿凸，镜子上写着“objects in the mirror are closer than they appear".

现在有的车（Ford）镜子的远端上角有一小块更凸的镜子，同时看它和主要的镜子基本可以取代shoulder check。

 

[uglyducking]

 

[uglyducking]

Question
Why does the passenger side window on my car state 'objects in mirror are closer than they appear?
Asked by: Suzanna

Answer
I think if you are in the U.S., the actual correct answer would be 'so that they may not be sued for damages later'. Fun aside, there is a simple physical explanation for that warning on the passenger side window.

First, let us note that as human beings, one of the clues for distance perception is the apparent size of the object we are looking at, compared to the 'real' size. For example, if you see a person that looks about the same size as your thumb with the arm stretched out, it's pretty certain the person is quite far away, and not a tiny person close-up. Although there are other clues for depth perception, they are mostly useless when observing objects through a small mirror.

If you inspect both side mirrors on your car, you will find out that the driver side mirror is planar, while the passenger side mirror is (convex) spherical. The driver side mirror, being planar, does not alter the size of the objects, they look about the same size in the mirror as they would if you turned your head around and looked at them directly. (Well, almost. The difference is about twice the distance from your eye to the mirror.)

For the passenger side mirror, a planar mirror would not do, since since it is further away from your eye, it would be very limited in the range of vision it provides. So, we need either a huge mirror (not a very good or elegant alternative) or a mirror that can 'compress' images to that smaller size. The latter has been chosen, and the convex mirror is the tool that does the job of 'compression'. Just like the back of a spoon, anything in a convex mirror looks smaller than its actual size.

I suppose by now, you have figured out what the point is: Objects do look smaller in the passenger side mirror than they would if you looked directly at them. So, you _may_ perceive them as being further behind you than they actually are. This may cause you to try to pull off a stunt which you would not have attempted if you knew they were right behind you. So, the warning is there to tell you of this possibility (and again, to avoid getting sued!).

As a side point, looking at the surroundings in the mirror (road lines etc.) helps better perceive the distance of the cars behind you. However, don't keep staring at the mirror too long, or you might fail to see what's in front of you! (This warning is here so that _I_ won't get sued! )
Answered by: Yasar Safkan, Ph.D., Software Engineer, Noktalar A.S., Istanbul, Turkey

 

[南岸]

你确定国内的镜子是凸镜吗？有多凸？凸到可以取代shoulder check？

这的车的镜子也是有点儿凸，镜子上写着“objects in the mirror are closer than they appear".

现在有的车（Ford）镜子的远端上角有一小块更凸的镜子，同时看它和主要的镜子基本可以取代shoulder check。

曲率半径R1200，更多的信息可以自己网上搜。

 

[uglyducking]

曲率半径R1200，更多的信息可以自己网上搜。

你的意思是寶馬奔馳法拉利為中國有專門的車鏡生產線專門為中國生產凸鏡側視鏡？

 

[uglyducking]

红旗还是夏利啊？

行业标准，都一样。

你的意思是寶馬奔馳法拉利為中國有專門的車鏡生產線專門為中國生產凸鏡側視鏡？

 

[南岸]

你的意思是寶馬奔馳法拉利為中國有專門的車鏡生產線專門為中國生產凸鏡側視鏡？

我说的是国产的后视镜，行业标准是凸面，曲率半径可达R1200，具体到进口车是否要符合中国的行业标准，那您得问中国的政府职能部门，有法规，您还得问问执法部门，严格执法吗？
知道您闲的蛋疼，想抬杠。

 

[ccc]

类似这东东。看得我晕！

 

[uglyducking]

我说的是国产的后视镜，行业标准是凸面，曲率半径可达R1200，具体到进口车是否要符合中国的行业标准，那您得问中国的政府职能部门，有法规，您还得问问执法部门，严格执法吗？
知道您闲的蛋疼，想抬杠。

好吧，那就再抬一次，那个镜子就可以取代shoulder check 了？

 

[Mikejia]

左怪上左道，右拐上右道。当然不能绕大圈

 

[南岸]

好吧，那就再抬一次，那个镜子就可以取代shoulder check 了？

您可是搜索泰斗，还用我帮忙？

互动百科：后视镜
后视镜：让你开车再也没有视线死角的神奇大法

 

[uglyducking]

您可是搜索泰斗，还用我帮忙？

互动百科：后视镜
后视镜：让你开车再也没有视线死角的神奇大法

行业标准规定，平面镜的失真率不得大于3%，凸面镜的失真率不得大于7%，要求不能反映有歪曲变形的实物图像。因此，镜面的曲率半径就有一个限制范围，行业标准规定外后视镜的曲率半径为R1200，内后视镜的曲率半径为无限大(平面镜)。


内后视镜是平面镜。

 

[ccc]

好吧，那就再抬一次，那个镜子就可以取代shoulder check 了？

我是不会依赖那东西... 感觉不踏实。