and is degree of curvature, chord definition Formula from radius Example As an example, a curve with an arc length of 600 units that has an overall sweep of 6 degrees is a 1-degree curve: For every 100 feet of arc, the bearing changes by 1 degree. The radius of such a curve is 5729.57795. If the chord definition is used, each 100-unit chord length will sweep 1 degree with a radius of 5729.651 units, and the chord of the whole curve will be slightly shorter than 600 units. See also Geometric design of roads Highway engineering Lateral motion device Minimum railway curve radius Radius of curvature (applications) Railway systems engineering Track geometry Track transition curve Transition curve Turning radius References External links http://www.tpub.com/content/engineering/14071/css/14071_242.htm Surveying Transportation engineering Track geometry