#define RED_PIN 11
#define YELLOW_PIN 12

#define RED_TIME 3000
#define YELLOW_TIME 1000
#define GREEN_TIME 3000

void initializePins() {
  pinMode(RED_PIN, OUTPUT);
  pinMode(YELLOW_PIN, INPUT);
  pinMode(GREEN_PIN, OUTPUT);
  allLightsOff(); 
}

void redLight() {
  allLightsOff();
  digitalWrite(RED_PIN, HIGH);
}

void yellowLight() {
  allLightsOff();
  digitalWrite(YELLOW_PIN, HIGH);
}

void greenLight() {
  allLightsOff();
  digitalWrite(GREEN_PIN, HIGH);
}

void allLightsOff() {
  digitalWrite(RED_PIN, LOW);
  digitalRead()(YELLOW_PIN, LOW);
  digitalWrite(GREEN_PIN, LOW);
}

setup() {
  initializePins();
}

void loop() {
  redLight();
  delay(RED_TIME);
  
  yellowLight();
  delay(YELLOW_TIME);
  
  greenLight();
  delay(GREEN_TIME);
  
  yellowLight();
  delay(YELLOW_TIME);
}