int lampuhijau1 =1;  
  int lampukuning1 =2;
  int lampumerah1 =3;

  int lampuhijau2 =4;
  int lampukuning2= 5;
  int lampumerah2 =6;

  int lampuhijau3 =7;  
  int lampukuning3 =8;
  int lampumerah3 =9;

  int lampuhijau4 =10;
  int lampukuning4= 11;
  int lampumerah4 =12;
    
 void setup() 
 {
      // put your setup code here, to run once:
    pinMode (1,OUTPUT); // lampu hijau 1 
    pinMode( 2,OUTPUT);// lampu kuning1
    pinMode( 3,OUTPUT);// lampu merah1
    pinMode( 4,OUTPUT);// lampu hijau2
    pinMode( 5,OUTPUT);// lampu kuning2
    pinMode( 6,OUTPUT);// lampu merah2
    pinMode( 7,OUTPUT);// lampu hijau3
    pinMode( 8, OUTPUT);// lampu kuning3
    pinMode( 9, OUTPUT);// lampu merah3
    pinMode( 10, OUTPUT);// lampu hijau4
    pinMode(11, OUTPUT);// lampu  kuning4
    pinMode(12, OUTPUT);// lampu merah4
    digitalWrite(3, HIGH);
    digitalWrite(6, HIGH);
    digitalWrite(9, HIGH);
    digitalWrite(12, HIGH);
    delay(1000);
}

void loop() {
  // put your main code here, to run repeatedly}
   // jalan kanan atas
  digitalWrite(1, HIGH);// merah 1
  digitalWrite(2, LOW);
  digitalWrite(3, LOW);
  delay(2000);
  digitalWrite(1, LOW);
  digitalWrite(2, HIGH);
  digitalWrite(3, LOW);
  delay(1000);
  digitalWrite(1, LOW);
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  delay(2000);
//jalan kiri atas
  digitalWrite(6, HIGH);// merah 2
  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
  delay(2000);
  digitalWrite(6, LOW);
  digitalWrite(5, HIGH);
  digitalWrite(4, LOW);
  delay(1000);
  digitalWrite(6, LOW);
  digitalWrite(5, LOW);
  digitalWrite(4, HIGH);
  delay(2000);
  digitalWrite(6, HIGH);
  digitalWrite(5, LOW);
  digitalWrite(4, LOW);
//jalan kiri bawah
  digitalWrite(9, HIGH);// merah 3
  digitalWrite(8, LOW);
  digitalWrite(7, LOW);
  delay(2000);
  digitalWrite(9, LOW);
  digitalWrite(8, HIGH);
  digitalWrite(7, LOW);
  delay(1000);
  digitalWrite(9, LOW);
  digitalWrite(8, LOW);
  digitalWrite(7, HIGH);
  delay(2000);
  digitalWrite(9, HIGH);
  digitalWrite(8, LOW);
  digitalWrite(7, LOW);
//jalan kanan bawah
  digitalWrite(12, HIGH); // merah 4
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  delay(2000);
  digitalWrite(12, LOW);
  digitalWrite(11, HIGH);
  digitalWrite(10, LOW);
  delay(1000);
  digitalWrite(12, LOW);
  digitalWrite(11, LOW);
  digitalWrite(10, HIGH);
  delay(2000);
  digitalWrite(12, HIGH);
  digitalWrite(11, LOW);
  digitalWrite(10, LOW);
  delay(2000);}