void setup() {
  // Set pin modes for North lights
  pinMode(13, OUTPUT); // Red
  pinMode(12, OUTPUT); // Yellow
  pinMode(11, OUTPUT); // Green

  // Set pin modes for South lights
  pinMode(7, OUTPUT); // Red
  pinMode(6, OUTPUT); // Yellow
  pinMode(5, OUTPUT); // Green

  // Set pin modes for East lights
  pinMode(4, OUTPUT); // Red
  pinMode(3, OUTPUT); // Yellow
  pinMode(2, OUTPUT); // Green

  // Set pin modes for West lights
  pinMode(10, OUTPUT); // Red
  pinMode(9, OUTPUT); // Yellow
  pinMode(8, OUTPUT); // Green
}

void loop() {
  // Traffic light sequence for North-South direction (Green on North, Red on South)
  digitalWrite(11, HIGH); // North Green
  digitalWrite(13, LOW);  // North Red
  digitalWrite(12, LOW);  // North Yellow
  digitalWrite(5, LOW);   // South Green
  digitalWrite(7, HIGH);  // South Red
  digitalWrite(6, LOW);   // South Yellow
  delay(5000);            // Green light duration for 5 seconds

  // North Yellow, prepare to stop
  digitalWrite(11, LOW);  // North Green off
  digitalWrite(12, HIGH); // North Yellow on
  delay(2000);            // Yellow light duration for 2 seconds

  // North Red, South Green
  digitalWrite(12, LOW);  // North Yellow off
  digitalWrite(13, HIGH); // North Red on
  digitalWrite(5, HIGH);  // South Green on
  digitalWrite(7, LOW);   // South Red off
  delay(5000);            // Green light duration for 5 seconds

  // South Yellow, prepare to stop
  digitalWrite(5, LOW);   // South Green off
  digitalWrite(6, HIGH);  // South Yellow on
  delay(2000);            // Yellow light duration for 2 seconds

  // Traffic light sequence for East-West direction (Green on East, Red on West)
  digitalWrite(2, HIGH);  // East Green
  digitalWrite(4, LOW);   // East Red
  digitalWrite(3, LOW);   // East Yellow
  digitalWrite(8, LOW);   // West Green
  digitalWrite(10, HIGH); // West Red
  digitalWrite(9, LOW);   // West Yellow
  delay(5000);            // Green light duration for 5 seconds

  // East Yellow, prepare to stop
  digitalWrite(2, LOW);   // East Green off
  digitalWrite(3, HIGH);  // East Yellow on
  delay(2000);            // Yellow light duration for 2 seconds

  // East Red, West Green
  digitalWrite(3, LOW);   // East Yellow off
  digitalWrite(4, HIGH);  // East Red on
  digitalWrite(8, HIGH);  // West Green on
  digitalWrite(10, LOW);  // West Red off
  delay(5000);            // Green light duration for 5 seconds

  // West Yellow, prepare to stop
  digitalWrite(8, LOW);   // West Green off
  digitalWrite(9, HIGH);  // West Yellow on
  delay(2000);            // Yellow light duration for 2 seconds
}