Lyskryss (Traffic Light) With ARDUINO UNO (with code)

Lyskryss (Traffic Light) With ARDUINO UNO
Code:
int red = 13;
int yellow = 12;
int green = 11;
int red2 = 10;
int yellow2 = 9;
int green2 = 8;

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

void loop()
changeLights();
delay(3000);

void changeLights()

digitalWrite(green,HIGH);
digitalWrite(red2,HIGH);
digitalWrite(yellow,LOW);
digitalWrite(yellow2,LOW);
digitalWrite(green2,LOW);
digitalWrite(red,LOW);
delay(12000);

digitalWrite(green,LOW);
digitalWrite(yellow,HIGH);
digitalWrite(yellow2,HIGH);

delay(3000);

digitalWrite(green2,HIGH);
digitalWrite(yellow2,LOW);
digitalWrite(red,HIGH);
digitalWrite(red2,LOW);
digitalWrite(yellow,LOW);
delay(12000);

digitalWrite(yellow2,HIGH);
digitalWrite(red,HIGH);
digitalWrite(green2,LOW);
digitalWrite(green,LOW);
digitalWrite(yellow,HIGH);