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);
digitalWrite(4, HIGH);
digitalWrite(7, HIGH);
digitalWrite(10, HIGH);
}

void loop(){
jalur_a();
jalur_b();
//jalur_c();
}

void jalur_a(){;
digitalWrite(4, LOW);//merah
digitalWrite(2, HIGH);//hijau
delay(3000);
digitalWrite(2, LOW);//hijau
digitalWrite(3, HIGH);//kuning
delay(1000);
digitalWrite(3, LOW);//kuning
digitalWrite(4, HIGH);//merah
delay(700);

}
void jalur_b(){;
digitalWrite(7, LOW);//merah
digitalWrite(5, HIGH);//hijau
delay(3000);
digitalWrite(5, LOW);//hijau
digitalWrite(6, HIGH);//kuning
delay(1000);
digitalWrite(6, LOW);//kuning
digitalWrite(7, HIGH);//merah
delay(700);
}

void jalur_c(){;
digitalWrite(10, LOW);//merah
digitalWrite(8, HIGH);//hijau
delay(3000);
digitalWrite(8, LOW);//hijau
digitalWrite(9, HIGH);//kuning
delay(1000);
digitalWrite(9, LOW);//kuning
digitalWrite(10, HIGH);//merah
delay(700);
}