Our distances are not driving distances, but are calculated as a 'straight-line' distance that starts in Spring Valley. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Spring Valley) to Point B.
Our distance measurements begin at a specific point in Spring Valley. The point that we are using is located at these GPS coordinates - Latitude: 35.0190, Longitude: -92.0740 [Map]. In this case, the coordinates for Spring Valley have been provided by the Geographic Names Information System (GNIS).