The 'degree of a curve' on a road is defined as:
Choose the correct answer
Angle turned by the vehicle per metre of travel
Central angle subtended by an arc of 30 m length — relates to radius (R = 1718.87/D_c metres)
The slope of the curve
Horizontal distance from tangent to curve
Correct Answer
B. Central angle subtended by an arc of 30 m length — relates to radius (R = 1718.87/D_c metres)
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Degree of curve D_c: in India (IRC) and railways, defined as the angle subtended at the centre by an arc of 30 m (one chain). R = 1718.87/D_c (approx). For railways in India: also uses 30 m arc definition. American definition: angle subtended by 100 ft chord. Degree of curve = 0 for straight alignment.
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