When I upload several traces in a zip file they seem to get concatenated. Almost all of them begin and end at my house, so no problem. When they don't, how much of a problem are the spurious, long-distance connecting segments? I guess the same problem arises in single gpx files. Do people make efforts (are there filters) to eliminate these?

And on GPS Traces, should I be taking care to eliminate waypoints or do they have value?