# Traffic Engineering Questions and Answers – Capacity of Rotary

This set of Traffic Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Capacity of Rotary”.

1. Which of the following is a limitation of a rotary?
a) Rotaries are self-governing
b) Rotaries require a large area
c) Eliminates severe conflicts
d) Accidents are less

Explanation: Rotaries require large area hence they are a costly affair in urban areas. The advantages of rotary is that they are self-governing, eliminates severe conflicts and accidents.

2. How many traffic operations are there in a rotary?
a) 1
b) 2
c) 3
d) 4

Explanation: There are 3 traffic operations in a rotary and they are diverging, merging and weaving. Diverging is a traffic operation when the vehicles moving in one direction parts into different directions according to their destinations. Merging is the opposite of diverging and weaving is a combination of both.

3. The capacity of rotary is found out by the capacity of each weaving section.
a) True
b) False

Explanation: The statement, “The capacity of rotary is found out by the capacity of each weaving section” is true. The minimum of the capacity of all the weaving section is the capacity of rotary.

4. Which one of the following is the empirical formula to find the capacity of the weaving section?
a) Qw = (280w(1+e/w)(1-p/3))/(1+w/l)
b) Qw = (280w(1+e/w)(1-p/3))/(1-w/l)
c) Qw = (280w(1-e/w)(1-p/3))/(1+w/l)
d) Qw = (280w(1+e/w)(1*p/3))/(1+w/l)

Explanation: Qw = (280w(1+e/w)(1-p/3))/(1+w/l) is the empirical formula to find the capacity of the weaving section. Here, Qw = capacity of weaving section, w = weaving width, l = length of weaving, p = proportion of weaving traffic to the non-weaving traffic.

5. The capacity formula is valid only if the weaving width is between _______
a) 6 and 18 metres
b) 1 and 10 metres
c) 3 and 9 metres
d) 4 and 14 metres

Explanation: The capacity formula is valid only if the weaving width is between 6 and 18 metres.
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6. What are the upper limit and the lower limit of the traffic volume for the installation of a traffic rotary?
a) 3000 and 500 vehicles per hour
b) 5000 and 500 vehicles per hour
c) 6000 and 500 vehicles per hour
d) 3000 and 1000 vehicles per hour

Explanation: The upper limit and the lower limit of the traffic volume for the installation of a traffic rotary is 3000 and 500 vehicles per hour. Not every location is suitable for a rotary. Rotaries are also suitable when the traffic entering from all the four approaches are comparatively equal.

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