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A circular curve of a highway is designed for traffic moving at \( 72 \mathrm{~km} / \mathrm{h} \). If the radius of the
\( \mathrm{P} \) curved path is \( 100 \mathrm{~m} \), the correct angle of banking

W of the road should be given by:
(1) \( \tan ^{-1} \frac{2}{3} \)
(2) \( \tan ^{-1} \frac{3}{5} \)
(3) \( \tan ^{-1} \frac{2}{5} \)
(4) \( \tan ^{-1} \frac{1}{4} \)
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