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The road intersection shown in Figure 10.14 needs a traffic signal to handle the traffic flow. If cars from two different lanes could collide, then

The road intersection shown in Figure 10.14 needs a traffic signal to handle the traffic flow. If cars from two different lanes could collide, then cars from these two lanes will not be permitted to enter the intersection at the same time. What is the minimum number of signal phases that are needed to ensure safe traffic?

C. D G B E Figure 10.14: A road intersection in Exercise 10.12

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