Sounds like a very interesting project!
Can you help us understand what you want to do by posting some pictures of the kinds of roads or lines you want to detect? The RoadNavigation module is looking for a road as seen by a camera facing forward in a car. It basically looks for as many lines as it can find that all converge towards a single point (vanishing point) on the horizon line.
Are you also planning to have the camera facing forward, or maybe facing down as is more often the case with line followers?