Is there a way to calculate the coverage (sum) of polylines within a polygon when there are overlapping lines and parallel lines? I am working on finding route coverage of gps traces within a centerline route buffer, but ran into the issue of having multiple traces that run alongside each other, overlap, or have gaps. The result is numerous short polylines within the route polygon and no way of calculating if the lines provide full coverage of the route extent. For example, I have a route polygon that is 27 miles long, and has 56 polylines within it and the sum of the lines are 126 miles. Is there a way to get a mileage total of the lines without summarizing the overlapping/parallel lines also? Or are there any other steps I can take to find out if the traces provided full coverage of the route extent?

I am using ArcMap 10.5, advanced license.