We want to know the mean distance of the purple squiggly lines to the yellow straight lines (see attached). Just one mean distance to the nearest straight line. Do I need to convert the straight lines to points first?
Check out this thread, and this thread for ideas. Personally, I don't trust the method of turning the line vertices into points and measuring those distances, because that assumes the vertices are evenly distributed along the line. But, if you don't care about that, it would be the easiest way to estimate the distance between two lines.