Our distances are not driving distances, but are calculated as a 'straight-line' distance that stretches from Rolling Hills. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line from Point A (ie- Rolling Hills) to Point B.
Our distance measurements begin at a specific point in Rolling Hills. The point that we are using is located at these GPS coordinates - Latitude: 33.6543, Longitude: -86.5719 [Map]. In this case, the coordinates for Rolling Hills have been provided by the Geographic Names Information System (GNIS).