Task3/traffic_line_task/launch/route_distance_calibration.launch

<launch>
  <arg name="config" default="$(find traffic_line_task)/config/route_distance_calibration.yaml"/>

  <!-- Measurement only: this node never advertises or publishes /cmd_vel. -->
  <node pkg="traffic_line_task" type="route_distance_calibrator.py"
        name="route_distance_calibrator" output="screen">
    <rosparam command="load" file="$(arg config)"/>
  </node>
</launch>