int r1 = 13;
int y1 = 12;
int g1 = 11;

int r2 = 10;
int y2 = 9;
int g2 = 8;

int r3 = 40;
int y3 = 42;
int g3 = 44;

int r4 = 48;
int y4 = 50;
int g4 = 52;

int isobstacle1 = HIGH;
int isobstacle2 = HIGH;
int isobstacle3 = HIGH;
int isobstacle4 = HIGH;


//FOR NEAR OBJECTS
int obstacle_pin1= A2;
int obstacle_pin2= A3;
int obstacle_pin3= A4;
int obstacle_pin4= A5;

//FOR FAR OBJECTS
int obstacle_pin1a= A6;
int obstacle_pin2a= A7;
int obstacle_pin3a= A8;
int obstacle_pin4a= A9;

void setup(){
  pinMode(r1, OUTPUT);
  pinMode(y1, OUTPUT);
  pinMode(g1, OUTPUT);

  pinMode(r2, OUTPUT);
  pinMode(y2, OUTPUT);
  pinMode(g2, OUTPUT);

  pinMode(r3, OUTPUT);
  pinMode(y3, OUTPUT);
  pinMode(g3, OUTPUT);

  pinMode(r4, OUTPUT);
  pinMode(y4, OUTPUT);
  pinMode(g4, OUTPUT);

  pinMode(obstacle_pin1, INPUT);
  pinMode(obstacle_pin2, INPUT);
  pinMode(obstacle_pin3, INPUT);
  pinMode(obstacle_pin4, INPUT);

  pinMode(obstacle_pin1a, INPUT);
  pinMode(obstacle_pin2a, INPUT);
  pinMode(obstacle_pin3a, INPUT);
  pinMode(obstacle_pin4a, INPUT);
}

void loop(){
  isobstacle1 = digitalRead(obstacle_pin1);
  isobstacle2 = digitalRead(obstacle_pin2);
  isobstacle3 = digitalRead(obstacle_pin3);
  isobstacle4 = digitalRead(obstacle_pin4);
  

  //ONLY ROUTE 1 HAVE VEHICLES
 if(isobstacle1==LOW && isobstacle2==HIGH && isobstacle3==HIGH && isobstacle4==HIGH)
  {
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
  }

  //ONLY ROUTE 2 HAVE VEHICLES
  if(isobstacle1==HIGH && isobstacle2==LOW && isobstacle3==HIGH && isobstacle4==HIGH)
  {
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
  }

  //ONLY ROUTE 3 HAVE VEHICLES
  if(isobstacle1==HIGH && isobstacle2==HIGH && isobstacle3==LOW && isobstacle4==HIGH)
  {
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
  }

  //ONLY ROUTE 4 HAVE VEHICLES
  if(isobstacle1==HIGH && isobstacle2==HIGH && isobstacle3==HIGH && isobstacle4==LOW)
  {
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
  }

  //ONLY ROUTE 1 AND 3 HAVE VEHICLES
  if(isobstacle1==LOW && isobstacle2==HIGH && isobstacle3==LOW && isobstacle4==HIGH)
  {
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
  }

  //ONLY ROUTE 2 AND 4 HAVE VEHICLES

  if(isobstacle1==HIGH && isobstacle2==LOW && isobstacle3==HIGH && isobstacle4==LOW)
  {
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
  }

  //ONLY ROUTE 1 AND 2 HAVE VEHICLES
  if(isobstacle1==LOW && isobstacle2==LOW && isobstacle3==HIGH && isobstacle4==HIGH)
  {
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(2000);
  }

  //ONLY ROUTE 2 AND 3 HAVE VEHICLES
  if(isobstacle1==HIGH && isobstacle2==LOW && isobstacle3==LOW && isobstacle4==HIGH)
  {
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
  }

  //ONLY ROUTE 3 AND 4 HAVE VEHICLES
  if(isobstacle1==HIGH && isobstacle2==HIGH && isobstacle3==LOW && isobstacle4==LOW)
  {
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, HIGH);
    delay(2000);
  }
  

  //ONLY ROUTE 4 AND 1 HAVE VEHICLES
  if(isobstacle1==LOW && isobstacle2==HIGH && isobstacle3==HIGH && isobstacle4==LOW)
  {
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
  }

  //ONLY ROUTE 1, 2 AND 3 HAVE VEHICLES
  if(isobstacle1==LOW && isobstacle2==LOW && isobstacle3==LOW && isobstacle4==HIGH)
  {
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
  }

  //ONLY ROUTE 2, 3 AND 4 HAVE VEHICLES
  if(isobstacle1==HIGH && isobstacle2==LOW && isobstacle3==LOW && isobstacle4==LOW)
  {
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
  }

  //ONLY ROUTE 1, 3 AND 4 HAVE VEHICLE
  if(isobstacle1==LOW && isobstacle2==HIGH && isobstacle3==LOW && isobstacle4==LOW)
  {
      digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
  }

  //ONLY ROUTE 1, 2 AND 4 HAVE VEHICLES
  if(isobstacle1==LOW && isobstacle2==LOW && isobstacle3==HIGH && isobstacle4==LOW)
  {
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
  }

  //ALL ROUTES HAVE VEHICLE
  if(isobstacle1==LOW && isobstacle2==LOW && isobstacle3==LOW && isobstacle4==LOW)
  {
    digitalWrite(g1, HIGH);//1 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//1 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//2 GREEN
    digitalWrite(g2, HIGH);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//2 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, LOW);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, HIGH);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, LOW);
    delay(2000);
    digitalWrite(g1, LOW);//3 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, HIGH);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, HIGH);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//3 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, LOW);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, HIGH);
    digitalWrite(y4, HIGH);
    delay(2000);
    digitalWrite(g1, LOW);//4 GREEN
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, HIGH);
    digitalWrite(r1, HIGH);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, LOW);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, LOW);
    delay(4000);
    digitalWrite(g1, LOW);//4 YELLOW
    digitalWrite(g2, LOW);
    digitalWrite(g3, LOW);
    digitalWrite(g4, LOW);
    digitalWrite(r1, LOW);
    digitalWrite(r2, HIGH);
    digitalWrite(r3, HIGH);
    digitalWrite(r4, LOW);
    digitalWrite(y1, HIGH);
    digitalWrite(y2, LOW);
    digitalWrite(y3, LOW);
    digitalWrite(y4, HIGH);
    delay(2000);
  }
}