fbpx

Traffic Characteristics and Traffic Studies - IES Previous Year Questions

Updated upto IES 2022 

31. Which one of the following is not a part of ‘speed and delay’ studies ?

[IES 2019]

  1. Vehicle number method
  2. Interview technique
  3. License number method
  4. Floating car method
Answer: Option A
Explanation:
Speed and delay studies are carried out using the following methods:
  • Floating car (or) riding check method
  • License plate (or) vehicle number method
  • Interview technique
  • Elevated observations
  • Photographic technique

32.  The free mean speed on a roadway is found to be 80 kmph. Under stopped condition, the average spacing between the vehicles is 6.9 m. What is the capacity of flow ?

[IES 2021]

  1. 7200 vehicles/hour (per lane)
  2. 1450 vehicles/hour (per lane)
  3. 2900 vehicles/hour (per lane)
  4. 5800 vehicles/hour (per lane)
Answer: Option C
Explanation:
Jam density, kj =
1000 / S
=
1000 / 6.9
= 144.9 ≈ 145 veh/km
Under Greenshield Model, Maximum Capacity, Qmax =
vsf x kj / 4
=
80 x 145 / 4

⇒ Qmax= 2900 veh/hr

33.  Space-mean speed represents _____ .

[IES 2022]

  1. The effective speed with which a vehicle traverses a particular route between two terminals.
  2. The average speed of vehicles in a certain road length at any time.
  3. The average of instantaneous speed of observed vehicles at the spot. 
  4. The instantaneous speed of a vehicle at a specific section or location.
Answer: Option B
Explanation:
The space mean speed is the average speed at which the vehicles travel a certain length of road at any time.

34.  For traffic surveys using origin and destination studies, the most suitable method in case of heavy traffic and absence of skilled or untrained personnel is _____ .

[IES 2022]

  1. License plate method
  2. Work spot or home interview method
  3. Return post card method
  4. Road side interview method
Answer: Option C
Explanation:
  • License plate method is suitable when the considered area is small like an intersection or a small business centre. However, for a larger area, this method requires a large number of people to take simultaneous observations.
  • Home interview method and work spot interview method requires trained personnels to collect data from each member of the household and at the workspots (like offices, factories, etc.,) respectively.
  • Return post card method is suitable when the traffic is high and requires no trained personnels.
  • Road side interview method is not suitable for areas of heavy traffic as there will be congestion created due to the stopped vehicles.
PYQs of Competitive Exams :
Join Us On:
Scroll to Top