Our distances are not driving distances, but are calculated as a 'point-to-point' distance starting from Phoenixville. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Phoenixville) to Point B.
Our distance measurements begin at a specific point in Phoenixville. The point that we are using is located at these GPS coordinates - Latitude: 33.4559, Longitude: -86.8942 [Map]. In this case, the coordinates for Phoenixville have been provided by the Geographic Names Information System (GNIS).