int REDCAR1 = 21;
int YELLOWCAR1 = 22;
int GREENCAR1 = 23;
int REDCAR2 = 16;
int YELLOWCAR2 = 17;
int GREENCAR2 = 18;
int REDPED = 26;
int GREENPED = 27;
int BUTTON = 13;
int crossTime = 5000;
unsigned long changeTime;


void setup() {
  pinMode(REDCAR1, OUTPUT);
  pinMode(YELLOWCAR1, OUTPUT);
  pinMode(GREENCAR1, OUTPUT);
  pinMode(REDCAR2, OUTPUT);
  pinMode(YELLOWCAR2, OUTPUT);
  pinMode(GREENCAR2, OUTPUT);
  pinMode(REDPED, OUTPUT);
  pinMode(GREENPED, OUTPUT);
  pinMode(BUTTON, INPUT);

  digitalWrite(GREENCAR2, HIGH);
  digitalWrite(REDCAR1, HIGH);
  digitalWrite(REDPED, HIGH);
  digitalWrite(REDCAR2, LOW);
  digitalWrite(YELLOWCAR2, LOW);
  digitalWrite(YELLOWCAR1, LOW);
  digitalWrite(GREENCAR1, LOW);
  digitalWrite(GREENPED, LOW);
}

void loop() {
  if (millis() - changeTime >= crossTime + 4000) {
    changeLights();
  }
  }

void changeLights() {

  digitalWrite(GREENCAR2, LOW);
  digitalWrite(YELLOWCAR2, HIGH);
 delay(2000);

  digitalWrite(YELLOWCAR2, LOW);
  digitalWrite(REDCAR2, HIGH);

  digitalWrite(REDCAR1, LOW);
  digitalWrite(REDPED, LOW);
  digitalWrite(GREENCAR1, HIGH);
  digitalWrite(GREENPED, HIGH);
  delay(crossTime);

  digitalWrite(GREENCAR1, LOW);
  digitalWrite(YELLOWCAR1, HIGH);
  digitalWrite(GREENPED, HIGH);
  delay(2000);

  for (int x=0; x<10; x++) {

    digitalWrite(GREENPED, LOW);
    delay(100);
    digitalWrite(GREENPED, HIGH);
    delay(100);
   }
    digitalWrite(GREENPED, LOW);
{
    digitalWrite(REDCAR1, HIGH);
    digitalWrite(REDPED, HIGH);
    digitalWrite(GREENCAR2, HIGH);
    digitalWrite(YELLOWCAR1, LOW);
    digitalWrite(REDCAR2, LOW);
    digitalWrite(GREENCAR1, LOW);

    changeTime = millis();
}
}