tests/traffic_lights/plc.xml
2018-09-26 Andrey Skvortsov Cleanup examples so they look clean, nice and almost the same on Windows and GNU/Linux
2018-08-24 Andrey Skvortsov Make comment blocks in examples slightly bigger so text inside is always visible
2016-10-20 Andrey Skvortsov cleanup traffic lights example
2013-12-06 Laurent Bessard Added example of SFC simulating traffic lights