09 Feb '12, 4am

Japan to test traffic lights that work for colour-blind drivers as well

TOKYO - Japan is road testing new traffic lights that can be seen by people who are colour-blind as well as drivers with perfect vision. The signals have been developed by Prof Taro Ochiai from the Kyushu Sangyo University, with the first set of traffic lights installed in the southern city of Fukuoka. A second month-long test is to be started in Tokyo before the end of this month. Prof Ochiai began researching the use of light-emitting diodes in 2003, when they first began to be used in traffic lights in preference to regular light bulbs. Drivers with colour-blindness quickly reported that the LED signals were more difficult for them to discern based only on brightness as the visual indicator. Working with lighting manufacturer Koito Electric Industries, Prof Ochiai incorporated blue LEDs with four times the brightness of the other diodes in the shape of a cross through t...

Full article: http://www.todayonline.com/World/EDC120209-0000153/Japan-...

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