Synchronized Traffic Lights

// declare pins
int green1 = 8;
int green2 = 13;
int yellow1 = 9;
int yellow2 = 12;
int red1 = 10;
int red2 = 11;


void setup() {
// sets pins as output    
    pinMode(green1, OUTPUT);
    pinMode(green2, OUTPUT);
    pinMode(yellow1, OUTPUT);
    pinMode(yellow2, OUTPUT);
    pinMode(red1, OUTPUT);
    pinMode(red2, OUTPUT);
}

void loop() {
// here you can change which lights turn on when and for how long
  
   // green2 ON, red1 ON 
    digitalWrite(green1, LOW);
    digitalWrite(green2, HIGH);
    digitalWrite(yellow1, LOW);
    digitalWrite(yellow2, LOW);
    digitalWrite(red1, HIGH);
    digitalWrite(red2, LOW);
    delay(5000);
   // green2 ON, yellow2 ON, red1 ON
    digitalWrite(green1, LOW);
    digitalWrite(green2, HIGH);
    digitalWrite(yellow1, LOW);
    digitalWrite(yellow2, HIGH);
    digitalWrite(red1, HIGH);
    digitalWrite(red2, LOW);
    delay(1000);
   // yellow2 ON, red1 ON
    digitalWrite(green1, LOW);
    digitalWrite(green2, LOW);
    digitalWrite(yellow1, LOW);
    digitalWrite(yellow2, HIGH);
    digitalWrite(red1, HIGH);
    digitalWrite(red2, LOW);
    delay(2000);
   // red1 ON, red2 ON
    digitalWrite(green1, LOW);
    digitalWrite(green2, LOW);
    digitalWrite(yellow1, LOW);
    digitalWrite(yellow2, LOW);
    digitalWrite(red1, HIGH);
    digitalWrite(red2, HIGH);
    delay(2000);
   //green1 ON, red2 ON
    digitalWrite(green1, HIGH);
    digitalWrite(green2, LOW);
    digitalWrite(yellow1, LOW);
    digitalWrite(yellow2, LOW);
    digitalWrite(red1, LOW);
    digitalWrite(red2, HIGH);
    delay(5000);
   // green1 ON, yellow1 ON, red2 ON
    digitalWrite(green1, HIGH);
    digitalWrite(green2, LOW);
    digitalWrite(yellow1, HIGH);
    digitalWrite(yellow2, LOW);
    digitalWrite(red1, LOW);
    digitalWrite(red2, HIGH);
    delay(1000);
   // yellow1 ON, red2 ON
    digitalWrite(green1, LOW);
    digitalWrite(green2, LOW);
    digitalWrite(yellow1, HIGH);
    digitalWrite(yellow2, LOW);
    digitalWrite(red1, LOW);
    digitalWrite(red2, HIGH);
    delay(2000);
   // red1 ON, red2 ON
    digitalWrite(green1, LOW);
    digitalWrite(green2, LOW);
    digitalWrite(yellow1, LOW);
    digitalWrite(yellow2, LOW);
    digitalWrite(red1, HIGH);
    digitalWrite(red2, HIGH);
    delay(2000);
}