Blind Runner Alarm: Speed Measuring Device

#include <Servo.h>

#define BUZZ 2
#define T1 3
#define T2 4
#define E1 5
#define E2 6
#define servoPin 9
#define LED 13

Servo servo;

float wall1, wall2;
int school = 0;

void setup()
{
  Serial.begin(9600);
  pinMode(BUZZ, OUTPUT);
  pinMode(T1, OUTPUT);
  pinMode(T2, OUTPUT);
  pinMode(E1, INPUT);
  pinMode(E2, INPUT);
  pinMode(LED, OUTPUT);
  servo.attach(servoPin);
  get_dis(T1, E1);get_dis(T2, E2);get_dis(T1, E1);get_dis(T2, E2);
  get_dis(T1, E1);get_dis(T2, E2);get_dis(T1, E1);get_dis(T2, E2);
  Serial.println(wall1 = get_dis(T1, E1));
  Serial.println(wall2 = get_dis(T2, E2));
}

void loop()
{
  bool B = false;
  long Time = 0;
  while (1)
  {
    if (check_super(T1, E1, wall1) == 1)
      { B = true; Time = millis(); break; }
    else if (check_super(T2, E2, wall2) == 1)
      { B = false; Time = millis(); break; }
    if (check_super(T1, E1, wall1) == 2)
      { return; }
    else if (check_super(T2, E2, wall2) == 2)
      { return; }
  }
  delay(50);
  if (B)
    while (1)
    {
      if (check_super(T2, E2, wall2) == 1)
      {
        Time = millis() - Time;
        break;
      }
      else if (millis() - Time > 1000)
        break;
    if (check_super(T1, E1, wall1) == 2)
      { return; }
    }
  else
    while (1)
    {
      if (check_super(T1, E1, wall1) == 1)
      {
        Time = millis() - Time;
        break;
      }
      else if (millis() - Time > 1000)
        break;
    else if (check_super(T2, E2, wall2) == 2)
      { return; }
    }
  if (Time < 300)
  {
    BUZZER(2000);
    digitalWrite(LED, LOW);
  }
  delay(1000);
}

int check_super(int tri, int echo, float wall)
{
  delay(10);
  float F = get_dis(tri, echo);
  Serial.println(F);
  int B = ((wall * (float)4) / (float)5 > F) ? 1 : 0;
  B = (F > (float)1000) ? 2 : B;
  delay(10);
  return B;
}

float get_dis(int tri, int echo)
{  
  digitalWrite(tri, HIGH);
  delayMicroseconds(15);
  digitalWrite(tri, LOW);
  delayMicroseconds(10);
  float dis = 0.017 * pulseIn(echo, HIGH);
  return dis;
}

void BUZZER(int T)
{
  long Time = T + millis();
  int delayed_T = 0, LED_state = HIGH;
  while(1)
  {
    digitalWrite(BUZZ, HIGH);
    delay(1);
    digitalWrite(BUZZ, LOW);
    delay(1);
    if (millis() > Time)
      break;
    delayed_T += 2;
    if (delayed_T > 100)
    {
      digitalWrite(LED, LED_state);
      LED_state = (LED_state == HIGH) ? LOW : HIGH;
      delayed_T = 0;
    }
  }
}