What the mean of the trafficLight in roadnet file

[WaterFountain-Jack]

From the doc for cityflow introduction :https://cityflow.readthedocs.io/en/latest/roadnet.html,I saw the explain for the availableRoadLinks which is a attribute of trafficLight:

But I found maybe a problem in this demo: the value of availableRoadLinks is [0,2],but there just one roadLinks in this demo.I am confused about the index 2, is it out of the range?

[zhc134]

this is just a demo file to illustrate the format, you can find working examples here

[WaterFountain-Jack]

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