const int redPin = 13;
const int yellowPin = 12;
const int greenPin = 14;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
}

void loop() {
  // Red light (Stop)
  digitalWrite(redPin, HIGH);
  delay(5000);
  digitalWrite(redPin, LOW);

  // Yellow light (Prepare to stop)

  // Green light (Go)
  digitalWrite(greenPin, HIGH);
  delay(5000);
  digitalWrite(greenPin, LOW);
  
  for (int i = 0; i < 3; i++) {
    digitalWrite(yellowPin, HIGH);
    delay(1000);  // Yellow light duration
    digitalWrite(yellowPin, LOW);
    delay(1000);  // Off duration (blinking effect)
  }
}