public CarAgent agent;  //

    private void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.CompareTag("obstacle"))
        {
            agent.hitACar();
        }
    }
    public CarAgent agent;  //

    private void OnCollisionEnter(Collision collision)
    {
        if (collision.gameObject.CompareTag("obstacle"))
        {
            agent.hitACar();
        }
        if (collision.gameObject.CompareTag("human"))
        {
            Debug.Log("Hit a Human");
            agent.hitAHuman();
        }
    }