Gets Away from Naughty

#define trigPin 2
#define echoPin 3
#define LEDlampRed 4B
#define LEDlampYellow 5
#define LEDlampGreen 6 
#define soundbuzzer 7
int sound = 500;


void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(LEDlampRed, OUTPUT);
  pinMode(LEDlampYellow, OUTPUT);
  pinMode(LEDlampGreen, OUTPUT);
  pinMode(soundbuzzer, OUTPUT);
}
void loop() {
  long durationindigit, distanceincm;
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  durationindigit = pulseIn(echoPin, HIGH);
  distanceincm = (durationindigit/5) / 29.1;
 
  if (distanceincm < 50) {
      digitalWrite(LEDlampGreen, HIGH);
}
  else {
      digitalWrite(LEDlampGreen, LOW);
  }
  
  if (distance < 20) {
    digitalWrite(LEDlampYellow, HIGH);
}
  else {
    digitalWrite(LEDlampYellow,LOW);
  }
  if (distance < 5) {
    digitalWrite(LEDlampRed, HIGH);
    sound = 1000;
}
  else {
    digitalWrite(LEDlampRed,LOW);
  }
 
  if (distanceincm > 5 || distanceinsm <= 0){
    Serial.println("Outside the permissible range of distances");
    noTone(soundbuzzer);
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
    tone(buzzer, sound);
  }
  
  delay(300);
}