int red1 = 27;
int yellow1 = 14;
int green1 = 12;

int red2 = 16; 
int yellow2 = 4;
int green2 = 2;

int red3 = 17;
int yellow3 = 19;
int green3 = 18;

int red4 = 21;
int yellow4 = 23;
int green4 = 22;

void setup(){
  pinMode(red1, OUTPUT);
  pinMode(yellow1, OUTPUT);
  pinMode(green1, OUTPUT);
  
  pinMode(red2, OUTPUT);
  pinMode(yellow2, OUTPUT);
  pinMode(green2, OUTPUT);

  pinMode(red3, OUTPUT);
  pinMode(yellow3, OUTPUT);
  pinMode(green3, OUTPUT);

  pinMode(red4, OUTPUT);
  pinMode(yellow4, OUTPUT);
  pinMode(green4, OUTPUT);
}

void loop(){

  digitalWrite(green1, HIGH); 
  digitalWrite(yellow1, LOW);
  digitalWrite(red1, LOW);
  delay(5000); 
  
  digitalWrite(green1, LOW);
  digitalWrite(yellow1, HIGH); 
  delay(2000);

  digitalWrite(yellow1, LOW);
  digitalWrite(red1, HIGH);
  delay(1000);

  digitalWrite(green2, HIGH);
  digitalWrite(yellow2, LOW);
  digitalWrite(red2, LOW);
  delay(5000); 

  digitalWrite(green2, LOW);
  digitalWrite(yellow2, HIGH);
  delay(2000); 
  digitalWrite(yellow2, LOW);
  digitalWrite(red2, HIGH);
  delay(1000);

  digitalWrite(green3, HIGH);
  digitalWrite(yellow3, LOW);
  digitalWrite(red3, LOW);
  delay(5000);

  digitalWrite(green3, LOW);
  digitalWrite(yellow3, HIGH);
  delay(2000);

  digitalWrite(yellow3, LOW);
  digitalWrite(red3, HIGH);
  delay(1000);

  digitalWrite(green4, HIGH);
  digitalWrite(yellow4, LOW);
  digitalWrite(red4, LOW);
  delay(5000);

  digitalWrite(green4, LOW);
  digitalWrite(yellow4, HIGH);
  delay(2000);

  digitalWrite(yellow4, LOW);
  digitalWrite(red4, HIGH);
  delay(1000);
}