void setup()
  // put your setup code here, to run once:
pinMode (2,OUTPUT);
pinMode (3,OUTPUT);
pinMode (4,OUTPUT);
pinMode (5,OUTPUT);
pinMode (6,OUTPUT);
pinMode (7,OUTPUT);
pinMode (8,OUTPUT);
pinMode (9,OUTPUT);
pinMode (10,OUTPUT);
pinMode (11,OUTPUT);
pinMode (12,OUTPUT);
pinMode (13,OUTPUT);

void loop() {
 // put your main code here, to run repeatedly:
jalan_utara (); 
{

  void jalan_utara () {
    digitalWrite(2. HIGH);
    digitalWrite(3. LOW);
    digitalWrite(4. LOW);
    delay(2000);
    digitalWrite(2. LOW);
    digitalWrite(3. HIGH);
    digitalWrite(4. LOW);
    delay(1000);
    digitalWrite(2. LOW);
    digitalWrite(3. LOW);
    digitalWrite(4. HIGH)