| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a countdown traffic light to solve the problems that in the conventional traffic lights, each driver is required to instantly judge stop or passage at a traffic light when a green light turns yellow, and the judgment is difficult depending on the type of and the installation place of traffic lights, leading to traffic accidents. <P>SOLUTION: A countdown traffic light can notify a driver of the timing that a traffic light shifts from green to yellow by displaying the left time (the number of seconds) until the green light turns yellow on the green light of an LED traffic light and counting down it. <P>COPYRIGHT: (C)2012,JPO&INPIT |
