public function distance($from_nl_fourpp, $to_nl_fourpp, $algorithm = 'road')
    {
        $this->data = ['from_nl_fourpp' => $from_nl_fourpp, 'to_nl_fourpp' => $to_nl_fourpp, 'algorithm' => $algorithm];

        return $this->call('distance', $this->prepareData($this->data));
    }