Description: 1. Design requirements 1. Road has two-way AB, AB generally have cars, two of the released 10S. 2. Traffic light conversion must be 4 seconds blinking yellow light. 3. If the two had no car to maintain the status quo. 4. if unimpeded access all the way 10 seconds later, another car-free road, then continue to release this road until the road has another car. 5. if emergency vehicles through two red lights were not four seconds to stop the vehicles passed, so that emergency vehicles through 6. in the digital display various signs and the remainder of the passage of time.
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