Degree (°) 09
Degree (°) 09 :
A measure of curvature of railroad tracks or highways, used primarily in the U.S. When railroad tracks follow an arc of a circle, the angle of curvature is the angle (measured at the center of the circle) spanned by a chord of a standard length. In the U.S., the chord used is the U.S. chain of 100 feet (30.48 meters). In the metric world, a chord of 20 meters is sometimes used. On most U.S. rail lines curvatures are less than 6o (making the radius greater than 955 feet or 291 meters); on high speed lines they are less than 2o (making the radius greater than 2865 feet or 873 meters). For highways in the U.S., the angle of curvature is the angle (measured at the center of the circle) spanned by an arc 100 ft long
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