void setup()
{
  
  Serial.begin(115200);
  // traffic light 1
  pinMode(27, OUTPUT);
  pinMode(14, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(18, OUTPUT);
  //Traffic light 2
  pinMode(21, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(19, OUTPUT);
  

}


void loop()
{
  digitalWrite(27,HIGH);
  digitalWrite(21,HIGH);
  digitalWrite(18,HIGH);
  delay(1500);


  digitalWrite(27,LOW);
  digitalWrite(21, LOW);
  digitalWrite(18, LOW);
  delay(1500);
 
  digitalWrite(14, HIGH);
  digitalWrite(5, HIGH);
  delay(1500);
 
  digitalWrite(14, LOW);
  digitalWrite(5, LOW);
  delay(1500);


  digitalWrite(12, HIGH);
  digitalWrite(4, HIGH);
  digitalWrite(19, HIGH);
  delay(1500);


  digitalWrite(12, LOW);
  digitalWrite(4, LOW);
  digitalWrite(19, LOW);
  delay(1500);



 
}