const int red1=2;
const int yellow1=3;
const int green1=4;

const int red2=5;
const int yellow2=6;
const int green2=7;

const int red3=8;
const int yellow3=9;
const int green3=10;

const int red4=11;
const int yellow4=12;
const int green4=13;


void setup() {

pinMode(red1, OUTPUT);
pinMode(red2, OUTPUT);
pinMode(yellow1, OUTPUT);
pinMode(yellow2, OUTPUT);
pinMode(green1, OUTPUT);
pinMode(green2, OUTPUT);
pinMode(red3, OUTPUT);
pinMode(red4, OUTPUT);
pinMode(yellow3, OUTPUT);
pinMode(yellow4, OUTPUT);
pinMode(green3, OUTPUT);
pinMode(green4, OUTPUT);



}

void loop() {

  digitalWrite(green1, HIGH);
  digitalWrite(red2, HIGH);
  digitalWrite(red3, HIGH);
  digitalWrite(red4, HIGH);
  delay(5000);

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

  digitalWrite(yellow1, LOW);
  digitalWrite(red1, HIGH);
  digitalWrite(green2, HIGH);
  digitalWrite(red2, LOW);
  delay(5000);

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

  digitalWrite(yellow2, LOW);
  digitalWrite(red2, HIGH);
  digitalWrite(green3, HIGH);
  digitalWrite(red3, LOW);
  delay(5000);

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

  digitalWrite(yellow3, LOW);
  digitalWrite(red3, HIGH);
  digitalWrite(green4, HIGH);
  digitalWrite(red4, LOW);
  delay(5000);

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

  digitalWrite(yellow4, LOW);
  digitalWrite(red4, LOW);
  digitalWrite(red1, LOW);

}