int TRAFFIC_RED = 13;
int TRAFFIC_YELLOW = 12;
int TRAFFIC_GREEN = 11;
int PED_GREEN = 6;
int PED_RED = 7;
int BUTTON_PIN = 3;

int buttonState = 0;

void setup() { 
  pinMode(TRAFFIC_RED, OUTPUT); 
  pinMode(TRAFFIC_YELLOW, OUTPUT); 
  pinMode(TRAFFIC_GREEN, OUTPUT); 
  pinMode(PED_RED, OUTPUT); 
  pinMode(PED_GREEN, OUTPUT); 
  pinMode(BUTTON_PIN, INPUT);
}

void loop() { 
  // inital state
  digitalWrite(TRAFFIC_RED, 0);
  digitalWrite(TRAFFIC_YELLOW, 0);
  digitalWrite(TRAFFIC_GREEN, 1);
  digitalWrite(PED_RED, 1);
  digitalWrite(PED_GREEN, 0);

  buttonState = digitalRead(BUTTON_PIN);
  if (buttonState == HIGH) {
    // show traffic yellow for 2sec
    digitalWrite(TRAFFIC_GREEN, 0);
    digitalWrite(TRAFFIC_YELLOW, 1);
    delay(2000);

    // show red traffic light and green pedestrian
    digitalWrite(TRAFFIC_YELLOW, 0);
    digitalWrite(TRAFFIC_RED, 1);
    digitalWrite(PED_RED, 0);
    digitalWrite(PED_GREEN, 1);
    delay(4000);

    // red ped light flash for 6 second
    digitalWrite(PED_GREEN, 0);
    digitalWrite(PED_RED, 1);
    delay(1000);

    digitalWrite(PED_RED, 0);
    delay(1000);

    digitalWrite(PED_RED, 1);
    delay(1000);
    
    digitalWrite(PED_RED, 0);
    delay(1000);

    digitalWrite(PED_RED, 1);
    delay(1000);
    
    digitalWrite(PED_RED, 0);
    delay(1000);   
  }
}