void setup() {
  // put your setup code here, to run once:
  pinMode(1, OUTPUT);
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(6, OUTPUT);
  pinMode(8, OUTPUT);
  pinMode(9, OUTPUT);
  pinMode(10, OUTPUT);
  }

void loop(){
  // put your main code here, to run repeatedly:
right_road();
left_road();
center_road();
}


void right_road(){
  digitalWrite(3, HIGH);
  delay(2000);
  digitalWrite(3, LOW);
  digitalWrite(1, HIGH);
  delay(2000);
  digitalWrite(1, LOW);
  digitalWrite(2, HIGH);
  delay(2000);
  digitalWrite(2, LOW);
  digitalWrite(3, HIGH);
}



void left_road(){
  digitalWrite(10,HIGH);
  delay(2000);
  digitalWrite(10,LOW);
  digitalWrite(8, HIGH);
  delay(2000);
  digitalWrite(8, LOW);
  digitalWrite(9, HIGH);
  delay(2000);
  digitalWrite(9, LOW);
  digitalWrite(10, HIGH);
} 



void center_road(){
  digitalWrite(4, HIGH);
  delay(2000);
  digitalWrite(4, LOW);
  digitalWrite(5, HIGH);
  delay(2000);
  digitalWrite(5, LOW);
  digitalWrite(6, HIGH);
  delay(2000);
  digitalWrite(6, LOW);
  digitalWrite(4, HIGH);
}