void OnTriggerEnter(Collider other)
{
if (other.tag == "Car")
{
CarAI car = other.gameObject.GetComponent <CarAI> ();
if (car.isGoingToSensor() || sensors.Count == 0)
{
car.setInitialDestination();
}
else
{
car.setDestination(getClosestSensorPosition(car.getInitialDestination()));
}
}
}