English
There are only four possibilities for vehicle operation at intersections. The circuit to realize these four states can be composed of two triggers, or a binary decimal counter or a binary counter. I use binary decimal counter 74LS90 to achieve. Using the feedback zeroing method to form a 4-ary counter, the required 4 states can be obtained from the output QQ.Chinese
只有四种可能在交叉口进行车辆操作。实现这四种状态的电路可以由两个触发器组成，或者由二进制十进制计数器或二进制计数器组成。我使用二进制十进制计数器74LS90来实现。使用反馈调零方法形成4进制计数器，可以从输出QQ获得所需的4个状态。
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