int red = 8;
int yellow = 9;
int green = 10;
int green2 = 7;
int yellow2 = 6;
int red2 = 5;

void setup() {
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
  pinMode(red2, OUTPUT);
  pinMode(yellow2, OUTPUT);
  pinMode(green2, OUTPUT);
}

void loop() {
  changeLights();
  delay(1000);
}

void changeLights() {

//green 1 on, red 2 on
  digitalWrite(red, LOW);
  digitalWrite(yellow, LOW);
  digitalWrite(green, HIGH);

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

//yellow 1 on, red 2 still on
  digitalWrite(red, LOW);
  digitalWrite(green, LOW);
  digitalWrite(yellow, HIGH);

   digitalWrite(red2, HIGH);
  digitalWrite(yellow2, LOW);
  digitalWrite(green2, LOW);
  delay(3000);

  //red 1 on, red 2 still on
  digitalWrite(green, LOW);
  digitalWrite(yellow, LOW);
  digitalWrite(red, HIGH);

  delay(2000);

// red 1 on, green 2 on
  digitalWrite(red2, LOW);
  digitalWrite(yellow2, LOW);
  digitalWrite(green2, HIGH);
  delay(5000);

  // red 1 still on, yellow2 on,
  digitalWrite(green2, LOW);
  digitalWrite(yellow2, HIGH);
  digitalWrite(red2, LOW);
  delay(3000);


// red 1 still on, red 2 on
  digitalWrite(green2, LOW);
  digitalWrite(yellow2, LOW);
  digitalWrite(red2, HIGH);
  delay(1000);

}