The 'transition curve' (spiral / clothoid) in a highway serves the purpose of:
Choose the correct answer
To increase design speed on the curve
To gradually change curvature from straight (R=∞) to circular (R=R), allowing gradual superelevation and centripetal force
To increase visibility on curves
To increase road width
Correct Answer
B. To gradually change curvature from straight (R=∞) to circular (R=R), allowing gradual superelevation and centripetal force
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Transition curve: a spiral (Euler spiral/clothoid) inserted between straight and circular curve where radius changes gradually from ∞ to R. Purpose: (1) gradually introduce centripetal acceleration; (2) enable gradual development of superelevation; (3) eliminate abrupt change in direction. Length of transition: Ls ≥ max of (comfort-based), superelevation runoff, IRC:38 minimum.
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