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GATE Exam Questions

Q1: A roundabout is provided with an average entry width of 8.4 m, width of weaving section as 14 m, and length of the weaving section between channelizing islands as 35 m. The crossing traffic and total traffic on the weaving section are 1000 and 2000 PCU per hour respectively. The nearest rounded capacity of the roundabout (in PCU per hour) is

A 3300

B 3700

C 4500

D 5200

ANS:B - 3700

Qw = 280w(1+e/w)(1-p/3)/(1+w/l).
e = 8.4
w = 14
l = 35
p = 1000/2000 = 0.5.

Put all the values above equation,
Qw = 3733.33~3700pcu/hr.



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