#define RED 1
#define YELLOW 5
#define GREEN 9

void setup() {
  pinMode(RED, OUTPUT);
  pinMode(YELLOW, OUTPUT);
  pinMode(GREEN, OUTPUT);
}

void loop() {
  

  

  // Red light ON (Stop)
  digitalWrite(RED, HIGH);
  delay(3000);
  digitalWrite(RED, LOW);

  // Yellow light ON (Caution)
  digitalWrite(YELLOW, HIGH);
  delay(1000);
  digitalWrite(YELLOW, LOW);
  
  
  // Green light ON (Safe to go)
  digitalWrite(GREEN, HIGH);
  delay(3000);
  digitalWrite(GREEN, LOW);


}