Flying Linear Features

Somewhat new to Litchi.
What is the best approach to setting up a linear feature - like flying a curved road - for video?
I have the ability to import lines from GIS software if needed.

You can import a CSV or KML file to create a Litchi Mission.
Then adjust speed, gimbal pitch, etc.

If all you want to do is to fly along a curved road, there is no need to import anything. Instead, using the Mission Hub, make sure your “Path Mode” is set to “Curved Turns” then place a few waypoints along the road. Adjust as necessary.

Running a parallel course above the shoulder of highways, I plot flight paths that replicate the gradual curvature of roads by placing waypoints closer together along the turns while making sure to adjust the arc radius at each waypoint to trace a nice smooth curving trajectory.