#define PIN_TRIG 3
#define PIN_ECHO 2
#define ir 13
#define led 7

int ir_value = 0;

void setup()
{
  Serial.begin(9600);

  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(led, OUTPUT);
  pinMode(ir, INPUT);
}

void loop()
{
 
  digitalWrite(PIN_TRIG, LOW);
  delayMicroseconds(2);

  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  long duration = pulseIn(PIN_ECHO, HIGH);
  int distance = duration / 58;  
 
  ir_value = digitalRead(ir);

 
  if (ir_value == HIGH)
  {
    digitalWrite(led, HIGH);
    Serial.println("Adjust throttle to drive on a lane");
  }
  else
  {
    digitalWrite(led, LOW);
    Serial.println("Vehicle on the lane");
  }


  if (distance < 20)
  {
    Serial.println("Slow down");
  }
  else if (distance > 30)
  {
    Serial.println("Maintain or increase speed");
  }
  else
  {
    Serial.println("Maintain speed");
  }

  delay(1000);
}