Controlling a traffic ligth with arduino.

A traffic ligth has 3 lamps, red, yellow and green. These lamps can be turned in off and on. Only one lamp is in ON.
There are 2 events, stop, and start
Start: Turn On the green ligth.
Stop: Turn Off the green ligth, turn on the yellow ligth for a moment, and then turn On de red ligth.
This is a class o structure can be programmed as object in arduino c++.

class Tligth{
private:
byte color;
byte ytime;
byte interval;

public:
  Tligth();
  void start();
  void stop();
  int getColor();
  int getYtime();
  void setYteme(int ms);
 void setInterval(int ms)
}