GATE Civil Engineering (CE) 2018 Shift 1 Solved Paper

Question : 46 of 65

Marks: +1, -0

A priority intersection has a single-lane one-way traffic road crossing an undivided two-lane two-way traffic road. The traffic stream speed on the single-lane road is 20 kmph and the speed on the two-lane road is

50 {kmph}

. The perception-reaction time is

2.5 {s}

, coefficient of longitudinal friction is

0.38

and acceleration due to gravity is

9.81 {m} \/ {s}^{2}

. A clear sight triangle has to be ensured at this intersection. The minimum lengths of the sides of the sight triangle along the two-lane road and the single-lane road, respectively will be

$50 {m}$ and $20 {m}$
$61 {m}$ and $18 {m}$
$111 {m}$ and $15 {m}$
$122 {m}$ and $36 {m}$

Validate

Solution:

{SSD}_{2}=0.278 × V t_{R}+\;{V^{2}}/{254 f}

=0.278 × 50 × 2.5+\;{50^{2}}/{254 × 0.38}≃

{SSD}_{1}=0.278 × 20 × 2.5+\;{20^{2}}/{254 × 0.38}≃

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