int redN = 2;
 int yellowN = 3;
 int greenN = 4;
 int redS = 5;
 int yellowS = 6;
 int greenS = 7;
 int redE = 8;
 int yellowE = 9;
 int greenE = 10;
 int redW = 11;
 int yellowW = 12;
 int greenW = 13;

int greenTime = 5000; 
int yellowTime = 2000;
int redTime = 2000;  

void setup() {
  pinMode(redN, OUTPUT);
  pinMode(yellowN, OUTPUT);
  pinMode(greenN, OUTPUT);
  pinMode(redS, OUTPUT);
  pinMode(yellowS, OUTPUT);
  pinMode(greenS, OUTPUT);
  pinMode(redE, OUTPUT);
  pinMode(yellowE, OUTPUT);
  pinMode(greenE, OUTPUT);
  pinMode(redW, OUTPUT);
  pinMode(yellowW, OUTPUT);
  pinMode(greenW, OUTPUT);
}

void loop() {
  
  trafficLightSequence(greenN, yellowN, redS, yellowS, greenS, redE, yellowE, greenE, redW, yellowW, greenW);
  

  trafficLightSequence(greenE, yellowE, redN, yellowN, greenN, redS, yellowS, greenS, redW, yellowW, greenW);
}

void trafficLightSequence(int greenLight, int yellowLight, int redLight1, int yellowLight1, int redLight2, int redLight3, int yellowLight3, int greenLight3, int redLight4, int yellowLight4, int greenLight4) {
  digitalWrite(greenLight, HIGH);
  delay(greenTime);
  
  digitalWrite(greenLight, LOW);
  digitalWrite(greenLight4, HIGH);
  digitalWrite(yellowLight, HIGH);
  delay(yellowTime);
  digitalWrite(yellowLight, LOW);

  digitalWrite(redLight1, HIGH);
  digitalWrite(redLight2, HIGH);
  digitalWrite(redLight3, HIGH);
  digitalWrite(redLight4, HIGH);
  
  delay(redTime);
  
  digitalWrite(yellowLight1, HIGH);
  delay(yellowTime);
  digitalWrite(yellowLight1, LOW);
}