#define RED_LED 27
#define YELLOW_LED 26
#define GREEN_LED 25

void setup() {
  pinMode(RED_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
}

void loop() {
  // Green Light ON (Go)
  digitalWrite(GREEN_LED, HIGH);
  delay(5000); // 5 seconds
  digitalWrite(GREEN_LED, LOW);

  // Yellow Light ON (Slow)
  digitalWrite(YELLOW_LED, HIGH);
  delay(2000); // 2 seconds
  digitalWrite(YELLOW_LED, LOW);

  // Red Light ON (Stop)
  digitalWrite(RED_LED, HIGH);
  delay(5000); // 5 seconds
  digitalWrite(RED_LED, LOW);
}