#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
int IRpininput1 = 2;
int IRpininput2 = 3;
int IRpinoutput1 = 4;
int IRpinoutput2 = 7;
int redledpin = 6 ;
int greenledpin = 5 ;
int yellowledpin = 9 ;
int carcounter1 = 0;
void setup() {
  // put your setup code here, to run once:
  pinMode(IRpininput1, INPUT);
  pinMode(IRpininput2, INPUT);
  pinMode(IRpinoutput1, INPUT);
  pinMode(IRpinoutput2, INPUT);
  pinMode(redledpin, OUTPUT);
  pinMode(greenledpin, OUTPUT);
  pinMode(yellowledpin, OUTPUT);
  lcd.begin();
  lcd.backlight();
  digitalWrite(yellowledpin, LOW);
  digitalWrite(greenledpin, LOW);
  digitalWrite(redledpin, LOW);
}
void loop() {
  // put your main code here, to run repeatedly:
  if (!digitalRead(IRpininput1)) {
    delay(500);
    carcounter1++;
  }
  if (!digitalRead(IRpininput2)) {
    delay(500);
    carcounter1++;
  }

  if (!digitalRead(IRpinoutput1)) {
    delay(500);
    if (carcounter1 != 0) {
      carcounter1--;
    }
  }

  if (!digitalRead(IRpinoutput2)) {
    delay(500);
    if (carcounter1 != 0) {
      carcounter1--;
    }
  }
  if ((carcounter1 > 4 && carcounter1 < 10 ) || (carcounter1 > 4 && carcounter1 < 10)) {
    digitalWrite(greenledpin, LOW);
    digitalWrite(redledpin, LOW);
    digitalWrite(yellowledpin, HIGH);
    lcd.clear();
    lcd.print("traffic ahead");
    delay(1000);
  } else if ((carcounter1 > 10) || (carcounter1 > 10)) {
    digitalWrite(yellowledpin, LOW);
    digitalWrite(greenledpin, LOW);
    digitalWrite(redledpin, HIGH);
    lcd.clear();
    lcd.print("slow down ");
    lcd.setCursor(0, 1);
    lcd.print("traffic ahead");
    delay(1000);
  } else if ((carcounter1 < 5) || (carcounter1 < 5)) {
    digitalWrite(redledpin, LOW);
    digitalWrite(yellowledpin, LOW);
    digitalWrite(greenledpin, HIGH);
    lcd.clear();
    lcd.print("the road is ");
    lcd.setCursor(0, 1);
    lcd.print("clear");
    delay(1000);
  }
}