const int greenNorth = 2;
const int yellowNorth = 3;
const int redNorth = 4;

const int greenEast = 5;
const int yellowEast = 6;
const int redEast = 7;

const int greenSouth = 8;
const int yellowSouth = 9;
const int redSouth = 10;

const int greenWest = 11;
const int yellowWest = 12;
const int redWest = 13;

const unsigned long greenDuration = 12000;
const unsigned long yellowDuration = 3000;  
const unsigned long cycleDuration = 15000;  

void setup() {
  
  pinMode(greenNorth, OUTPUT);
  pinMode(yellowNorth, OUTPUT);
  pinMode(redNorth, OUTPUT);

  pinMode(greenEast, OUTPUT);
  pinMode(yellowEast, OUTPUT);
  pinMode(redEast, OUTPUT);

  pinMode(greenSouth, OUTPUT);
  pinMode(yellowSouth, OUTPUT);
  pinMode(redSouth, OUTPUT);

  pinMode(greenWest, OUTPUT);
  pinMode(yellowWest, OUTPUT);
  pinMode(redWest, OUTPUT);
}

void loop() {
  // For North-South direction
  digitalWrite(redWest, HIGH);
  digitalWrite(redSouth, HIGH);
  digitalWrite(redEast, HIGH);
  digitalWrite(greenNorth, HIGH);
  delay(greenDuration);

  digitalWrite(greenNorth, LOW);
  digitalWrite(yellowNorth, HIGH);
  delay(yellowDuration);

  digitalWrite(yellowNorth, LOW);
  digitalWrite(redNorth, HIGH);
  digitalWrite(redWest, LOW);

  // For East-West direction
  digitalWrite(greenWest, HIGH);

  delay(greenDuration);

  digitalWrite(greenWest, LOW);
  digitalWrite(yellowWest, HIGH);
  delay(yellowDuration);

  digitalWrite(yellowWest, LOW);
  digitalWrite(redWest, HIGH);
  digitalWrite(redSouth, LOW);

  // For South-North direction
  digitalWrite(greenSouth, HIGH);
  delay(greenDuration);

  digitalWrite(greenSouth, LOW);
  digitalWrite(yellowSouth, HIGH);
  delay(yellowDuration);

  digitalWrite(yellowSouth, LOW);
 
  digitalWrite(redSouth, HIGH);
  digitalWrite(redEast, LOW);

  // For West-East direction
  digitalWrite(greenEast, HIGH);
  delay(greenDuration);

  digitalWrite(greenEast, LOW);
  digitalWrite(yellowEast, HIGH);
  delay(yellowDuration);

  digitalWrite(yellowEast, LOW);
  

  digitalWrite(redEast, HIGH);
  digitalWrite(redNorth, LOW);

}