Our distances are not driving distances, but are calculated as a 'straight-line' distance starting from Smyrna. A straight line distance ignores obstructions like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Smyrna) to Point B.
Our distance measurements begin at a specific point in Smyrna. The point that we are using is located at these GPS coordinates - Latitude: 35.6509, Longitude: -92.9199 [Map]. In this case, the coordinates for Smyrna have been provided by the Geographic Names Information System (GNIS).