public function getTravelModes()
    {
        $travelModes = [];
        for ($i = 0; $i <= 4; $i++) {
            $travelModes[$i] = LocalizationUtility::translate(
                'tx_gomapsext_domain_model_map.travel_mode.' . $i,
                'go_maps_ext'
            );
        }

        return $travelModes;
    }