The 'superelevation development' in horizontal curves must be achieved within the:
Choose the correct answer
Circular curve portion only
Transition curve (spiral) or approach tangent — superelevation changed gradually before and into the curve to avoid abrupt cross-slope change
Only on the exit tangent after the curve
At bridge approaches only
Correct Answer
B. Transition curve (spiral) or approach tangent — superelevation changed gradually before and into the curve to avoid abrupt cross-slope change
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Superelevation development (IRC:38): transition (spiral) curve or approach tangent before start of circular curve. SE developed from normal (adverse) camber through zero camber to full superelevation (e). Rotation: about centreline (for divided roads) or about inner edge (for undivided). Length: minimum = transition curve length or as given by design speed and camber change rate. Prevents sudden cross-slope change causing discomfort.
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