Question:
so many people have red-green color blindness or色弱, why the traffic lights traffic lights designed?
Answer:
the history of traffic lights:
today, the traffic lights installed at various crossings, the vehicle to ease the traffic has become the most common and most effective means. However, this technology has been in the 19th century emerged.
1858, in the main streets of London to install a gas-fired light red, blue and white lights of the mechanical-type wrench for carriage movement command. This is the world 2 January, 1869, gas light exploded, so that police officers were injured, was canceled.
1914, the electric start of the traffic lights appear in the United States. This red and green traffic lights from yellow tri-color circular optical components for installation in New York City on the 5th of a tower on the street. Said red light
1918 years, has emerged with control of traffic lights and infrared lights. With the control of traffic lights, a pressure detector is an in the ground, the vehicle will become a green light near the red light; the other is using a megaphone to start the traffic lights, the Secretary for the opportunity when the red light click叭cough, which makes the red light into green light. Infra-red traffic light when the pedestrian path on the pressure-sensitive surface, it will be able to detect any need to cross the road. Infrared beam of red light signal can extend the period of time, to postpone the release vehicle to avoid traffic accidents.
signal the emergence of effective traffic control, for ease traffic flow, improve the road capacity, the effect of significantly reducing traffic accidents.
1968, the United Nations the meaning of the various lights on. Traffic signal is green, in the face of green vehicles will be allowed to go straight, left turn and right turn, unless a sign of a shift prohibited. About turning vehicles must be allowed to legally are in vehicles at road junctions and pedestrian crossing over the pedestrian priority access. The red signal is the cut-line, in the face of a red light at the intersection of the vehicle must be after the stop line stopping. Yellow is a warning signal, in the face of yellow light vehicles can not cross the stop line, but have been very close to the vehicle stop line and not safe to enter the intersection when parking. Since then, the beginning of this provision in the world GM.
Answer:
This is also a lot of factors to consider, these two colors in the rain, fog, resolution better than the other colors2008-04-08
问题:
那么多人有红绿色色盲或色弱，为什么还要把交通指示灯设计成红绿灯？
回答:
红绿灯的历史：
在今天，红绿灯安装在各个道口上，已经成为疏导交通车辆最常见和zyx的手段。但这一技术在19世纪就已出现了。
1858年，在英国伦敦主要街头安装了以燃煤气为光源的红，蓝两色的机械扳手式信号灯，用以指挥马车通行。这是世界上最早的交通信号灯。1868年，英国机械工程师纳伊特在伦敦威斯敏斯特区的议会大厦前的广场上，安装了世界上最早的煤气红绿灯。它由红绿两以旋转式方形玻璃提灯组成，红色表示“停止”，绿色表示“注意”。1869年1月2日，煤气灯爆炸，使jc受伤，遂被取消。
1914年，电气启动的红绿灯出现在美国。这种红绿灯由红绿黄三色圆形的投光器组成，安装在纽约市5号大街的一座高塔上。红灯亮表示“停止”，绿灯亮表示“通行”。
1918年，又出现了带控制的红绿灯和红外线红绿灯。带控制的红绿灯，一种是把压力探测器安在地下，车辆一接近红灯便变为绿灯；另一种是用扩音器来启动红绿灯，司机遇红灯时按一下嗽叭，就使红灯变为绿灯。红外线红绿灯当行人踏上对压力敏感的路面时，它就能察觉到有人要过马路。红外光束能把信号灯的红灯延长一段时间，推迟汽车放行，以免发生交通事故。
信号灯的出现，使交通得以有效管制，对于疏导交通流量、提高道路通行能力，减少交通事故有明显效果。
1968年，联合国《道路交通和道路标志信号协定》对各种信号灯的含义作了规定。绿灯是通行信号，面对绿灯的车辆可以直行，左转弯和右转弯，除非另一种标志禁止某一种转向。左右转弯车辆都必须让合法地正在路口内行驶的车辆和过人行横道的行人优先通行。红灯是禁行信号，面对红灯的车辆必须在交叉路口的停车线后停车。黄灯是警告信号，面对黄灯的车辆不能越过停车线，但车辆已十分接近停车线而不能安全停车时可以进入交叉路口。此后，这一规定在全世界开始通用。
回答:
这也是考虑很多因素的，这两种颜色在雨天，雾天，分辨率都比其他颜色的要好2008-04-08