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Question

# A horizontal circular curve with a centre line radius of 250 m is provided on a 2-way, 2-lane State Highway. The width of two-lane road is 7.5 m. Design speed = 90 kmph. The brake reaction time is 2.5 seconds and coefficient of friction in longitudinal and lateral direction are 0.35 and 0.15 respectively. The set back distance from the central line of the road considering Lc > SSD is

A
11.90 m
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B
13.71 m
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C
None of these
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D
11.30 m
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Solution

## The correct option is B 13.71 mSSD = vtr+v22gf =0.278×90×2.5+(0.278×90)22×9.81×0.35=153.66m For Lc>SSD Set back distance (m′)=R−(R−d)cosα2; α2=180×SSD2π(R−d)=17.74∘ m′=250−(250−1.875)cos17.74=13.68 m

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