Consider a traffic light system at a four-way crossroads (e.g., two roads intersecting at right angles). Assume the simplest algorithm for cycling through the lights (e.g., all traffic on one road is allowed to go through the crossroad while the other traffic is stopped). Identify the states of this system and draw a statechart describing them. Remember that each individual traffic light has three states (i.e. green, yellow, and red).
What will be an ideal response?
We model this system as two groups of lights, one for each road. Opposing lights have always the same value. Lights
from at least one group must always be red for safety reasons. We assume there are no separate lights for left and right
turns and that cycles are fixed. Figure 5-6 depicts the startchart diagram for this solution.
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