"Body parts" murder II

The gruesome body parts murder has a new installment with the discovery of a fifth body part, quite near to some of the others. You can see a the distribution of finds on Google Maps.

This adds another element to the data set. The route between points "A" and "B" is curious and uses a lot of back roads, if that IS the route. Clearly these grisly finds have a pattern, but can they be traced back to the origin?