英语翻译If we are driving a car or crossing crossroad,we will st

英语翻译
If we are driving a car or crossing crossroad,we will stop when the traffic lights turn red.Why do we use red instead of other colors?
As we know,scattering occurs when lights go through the air.For the same media,if the wavelength is long,the scattering will be short.If the wavelength is short,then the scattering will be long.
Of all of the visible lights,red has the longest wavelength about 1.7 times that of purple,so the scattering is the weakest.That means red light travels far.In fact,it travels farther on rainy or foggy days because of the reduced air transparency.
Using red lights as a stop signal helps drivers in more remote areas see the signal.It helps drivers slow down or brake in time.If drivers didn't see the stop signal until they were close,they may not be able to stop the car in time,possibly causing an accident.Red is also a color that excites people,the optic nerve especially responds to red.In short,red lights help drivers stop in time and help prevent accidents.
Red lights are not only used for stop signals but also warnings.For example,red lights are installed on the tops of tall buildings in cities so that pilots in aircraft can clearly see them at night.Red lights are also used for public security and fire department vehicles.
不要在线翻译的句子不通

为什么我们用红灯作为“停”信号?
如果我们驾车或者穿越马路,在路灯变红的时候会停下来.为什么我们用红色而不用其它颜色?
我们知道,光进入空气之后会分散.对于同样的介质,若波长长,则分散短（理解成分散不明显吧）.若波长短,则分散长.
在所有的可见光中,红光是波长是最长的,大约是紫光的1.7倍,所以红光的分散效应最弱.这意味着红光可以传播得最远.实际上,在雨天或者有雾的天气,红光传播得更远,因为空气透明度降低（即介质“浓度”增大吧）.
使用红灯作为停止信号灯可以使更远区域内的驾驶员看见信号.这使得驾驶员们能够及时减速或停车.如果驾驶员直到驾驶地够近才看见停止信号,他们可能不能够及时停车,造成事故.红色也是能够刺激人的颜色,视觉神经对红色反应最为强烈.总之,红灯可以使驾驶员及时停车,避免发生事故.
红灯不仅仅用作停止信号,它也被用作警告.比如,红灯被安装在城市高楼顶部,比便于飞行员在夜间能够看见这些楼宇.红灯也被用于公共安全领域和消防车.
文章很简单,码字却很累.