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In which is curve has two circular arcs are in opposite direction on common tangent.
Simple
Compound
Reverse
All of these
Reverse
Quick Trick: Remember 'Reverse = Reflected/Opposite directions'. Look for the key term 'opposite direction' in the question to instantly identify a Reverse Curve without detailed calculations.
Remember 'Reverse = Reflected/Opposite directions'. Look for the key term 'opposite direction' in the question to instantly identify a Reverse Curve without detailed calculations.
Define key term - Reverse Curve
A reverse curve (or serpentine curve) consists of two circular arcs bending in opposite directions. These two arcs meet at a point of reverse curvature on a common tangent.
Differentiate from Simple and Compound Curves
A Simple curve consists of a single arc of uniform radius. A Compound curve consists of two or more arcs of different radii bending in the same direction on the same side of a common tangent.
Match definition with options
Since the question specifically mentions two arcs turning in opposite directions along a common tangent, it satisfies only the definition of a Reverse curve.
A: Simple curve has only one single arc. B: Compound curve has two or more arcs turning in the SAME direction, not opposite. D: All of these is incorrect as Simple and Compound curves do not fit the criteria.
C is correct because a reverse curve strictly consists of two circular arcs bending in opposite directions along a common tangent point.
Watch for keywords: 'same direction' implies a Compound curve, whereas 'opposite direction' or 'S-shape/serpentine' always points to a Reverse curve.