int Lane1[]={13,12,11};
int Lane2[]={10,9,8};
int Lane3[]={7,6,5};
int Lane4[]={4,3,2};
void setup()
{
  for(int i=0;i<3;i++)
  {
    pinMode(Lane1[i],OUTPUT);
    pinMode(Lane2[i],OUTPUT);
    pinMode(Lane3[i],OUTPUT);
    pinMode(Lane4[i],OUTPUT);
  }

  for(int i=0;i<3;i++)
  {
    digitalWrite(Lane1[i],LOW);
    digitalWrite(Lane2[i],LOW);
    digitalWrite(Lane3[i],LOW);
    digitalWrite(Lane4[i],LOW);
  }
}
void loop()
{
  digitalWrite(Lane1[2],HIGH);
  digitalWrite(Lane3[0],HIGH);
  digitalWrite(Lane4[0],HIGH);
  digitalWrite(Lane2[0],HIGH);
  delay(7000);

  digitalWrite(Lane1[2],LOW);
  digitalWrite(Lane3[0],LOW);
  digitalWrite(Lane1[1],HIGH);
  digitalWrite(Lane3[1],HIGH);
  delay(3000);

  digitalWrite(Lane1[1],LOW);
  digitalWrite(Lane3[1],LOW);
  digitalWrite(Lane1[0],HIGH);
  digitalWrite(Lane3[2],HIGH);
  delay(7000);

  digitalWrite(Lane3[2],LOW);
  digitalWrite(Lane4[0],LOW);
  digitalWrite(Lane3[1],HIGH);
  digitalWrite(Lane4[1],HIGH);
  delay(3000);

  digitalWrite(Lane3[1],LOW);
  digitalWrite(Lane4[1],LOW);
  digitalWrite(Lane3[0],HIGH);
  digitalWrite(Lane4[2],HIGH);
  delay(7000);

  digitalWrite(Lane4[2],LOW);
  digitalWrite(Lane2[0],LOW);
  digitalWrite(Lane4[1],HIGH);
  digitalWrite(Lane2[1],HIGH);
  delay(3000);

  digitalWrite(Lane4[1],LOW);
  digitalWrite(Lane2[1],LOW);
  digitalWrite(Lane4[0],HIGH);
  digitalWrite(Lane2[2],HIGH);
  delay(7000);

  digitalWrite(Lane1[0],LOW);
  digitalWrite(Lane2[2],LOW);
  digitalWrite(Lane1[1],HIGH);
  digitalWrite(Lane2[1],HIGH);
  delay(3000);

  digitalWrite(Lane2[1],LOW);
  digitalWrite(Lane1[1],LOW);
}