machine_name    : "Three-state traffic light, plus off and flash-red";
machine_version : 1.2.1;

jssm_version    : >= 5.0.0;
graph_layout    : dot;

on_init         : ${setup};
on_halt         : ${finalize};



/* turn on */
Off 'Enable' { follow: ${turned_on}; } -> Red;

// main sequence
Red 'Proceed' => Green 'Proceed' => Yellow 'Proceed' => Red;

// emergency flash red
[Red Yellow Green] 'Flash' -> Flash;
Flash 'Proceed' { label: 'no change'; } -> Flash 'Exit' -> Red;

// turn off
[Red Yellow Green Flash] 'Disable' { follow: ${turned_off}; } ~> Off;