A transition (spiral) curve is provided between a straight and a circular curve on a highway to:
Choose the correct answer
Increase the radius of curvature suddenly
Gradually introduce superelevation and widen the road, and allow centrifugal force to build up gradually
Provide a safe braking distance
Mark the start of the horizontal curve
Correct Answer
B. Gradually introduce superelevation and widen the road, and allow centrifugal force to build up gradually
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Transition curves (Euler spiral/clothoid): curvature changes gradually from 0 (tangent) to 1/R (circular curve). This allows gradual: introduction of superelevation, extra widening, and smooth change in centrifugal acceleration for driver comfort.
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