void setup() {
  // lalulintas 2 jalur
pinMode(2, OUTPUT);
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(9, OUTPUT);
pinMode(10, OUTPUT);
pinMode(11, OUTPUT);

digitalWrite(2, HIGH);//LED WARNA MERAH NYALA TERUS
digitalWrite(9, HIGH);//LED WARNA MERAH NYALA TERUS
}

void loop() {
  // jalan 1
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
  delay(1000);
  digitalWrite(3, LOW);
  digitalWrite(4, HIGH);
  delay(3000);
  digitalWrite(4, LOW);
  digitalWrite(3, LOW);
  delay(1000);
  digitalWrite(3, LOW);
  digitalWrite(2, HIGH);

  // jalan 2
  digitalWrite(9,  LOW);
  digitalWrite(10, HIGH);
  delay(1000);
  digitalWrite(10, LOW);
  digitalWrite(11, HIGH);
  delay(3000);
  digitalWrite(11, LOW);
  digitalWrite(10, HIGH);
  delay(1000);
  digitalWrite(10, LOW);
  digitalWrite(9, HIGH);

}