Traffic Characteristics and Traffic Studies - IES Previous Year Questions

21. Which one of the following traffic survey schemes is most relevant when deciding on locating major ‘routes’ in a city ?

[IES 2009]

  1. Origin and destination survey
  2. Speed survey
  3. Traffic capacity survey
  4. Traffic volume survey
Answer: Option A
Explanation:
Origin and Destination studies are carried out,
  • To judge the adequacy of existing routes.
  • To plan mass transit facilities in a city.
  • To locate major routes or expressway.
  • To locate new bridges depending on traffic demand.
  • To locate intermediate stops of public transport.

22.  Which one of the following equipments is useful in determining spot speed in traffic engineering ?

[IES 2009]

  1. Periscope
  2. Radar
  3. Tachometer
  4. Enoscope
Answer: Option D
Explanation:
Spot speed study is carried out using equipments like graphic recorder, electronic meter, photo electric meter, radar, speedmeter, enoscope, etc.,

23.  Match List-I (Type of survey) with List-II (method/Instrument) and select the correct answer using the codes given below the lists:

List-I

  1. Traffic volume study
  2. Speed and delay study
  3. Spot-speed study
  4. Multiple character studies

List-II

  1. Workspot interview method
  2. Doppler radar
  3. Floating car method
  4. Automatic vehicle counter and classifier
  5. Electronic detector

[IES 2010]

Codes: A B C D
  1.  1  3  2  5
  2.  5 2  3  4
  3.  1  2  3  4
  4.  5 3  2  4
Answer: Option D
Explanation:
  • Traffic volume studies are carried out by using mechanical counters or by manual counts.
  • Speed and delay studies are carried out using Floating car (or) riding check method, License plate (or) vehicle number method, Interview technique, Elevated observations, Photographic technique.
  • Spot speed study is carried out using equipments like graphic recorder, electronic meter, photo electric meter, radar, speedmeter, enoscope, etc.,

24.  Traffic capacity is the _____ .

[IES 2013]

  1. Number of vehicles occupying a unit length of roadway at a given instant expressed as vehicles/km.
  2. Capacity of lane to accommodate the vehicles widthwise (across the road).
  3. Maximum attainable speed of vehicles.
  4. Ability of roadway to accommodate traffic volume in terms of vehicles/hr.
Answer: Option D
Explanation:
Traffic capacity is defined as the ability of a roadway to accommodate the traffic volume. It is expressed as the maximum number of vehicles in a lane that can pass a given section in unit time, usually an hour i.e., vehicles per hour per lane.

25.  The design speed of a traffic lane is 70 kmph. What is the theoretical capacity per hour taking the total reaction time to be 2 seconds and average length of vehicles as 8 m ?

[IES 2014]

  1. 728
  2. 628
  3. 428
  4. 828
Answer: Option A
Explanation:
Design speed, v = 70 kmph = 19.44 m/s
Since, the reaction time is 2 secs, Space headway, S = vt +
v2 / 2gf
+ L
⇒ S = (19.44 x 2) +
19.442 / 2 x 9.81 x 0.4
+ 8 = 95.03 m
Thus, theoretical capacity, Q =
1000 v / S
=
1000 x 70 / 95.03

⇒ Q = 736.6 ≈ 737 veh/hr
Here, the closest answer is 728 veh/hr.

26.  What will be the theoretical maximum capacity (to nearest 10 units) for a single lane of highway given that the speed of the traffic stream is 40 kmph ?

[IES 2015]

  1. 2860 veh/h
  2. 2010 veh/h
  3. 2510 veh/h
  4. 3000 veh/h
Answer: Option A
Explanation:
Theoretical maximum capacity, Qmax =
1000 v / S

Where,
S - Space headway = 0.2 V + 6 = (0.2 x 40) + 6 = 14 m
Qmax =
1000 x 40 / 14
= 2857.14
⇒ Qmax ≈ 2858 veh/h
Here, the closest answer is 2860 veh/h.

27.  Overspeed and delay studies on a preselected section of a highway are conducted by _____ .

[IES 2016]

  1. Fast moving car method
  2. Endoscopy
  3. Radar
  4. Traffic contours
Answer: Option A
Explanation:
Speed and delay studies are carried out using the following methods:
  • Floating car (or) Moving car (or) Riding check method
  • License plate (or) vehicle number method
  • Interview technique
  • Elevated observations
  • Photographic technique

28.  International Traffic Intelligent Survey Data are related with _____ .

[IES 2016]

  1. Speed and delay studies
  2. Classified traffic volume studies
  3. Accident profiling studies
  4. Origin and destination studies
Answer: Option D
Explanation:

29.  A transportation trip survey was undertaken between private car and public car transportation. The proportion of those using private cars is 0.45. While using the public transport, the further choices available are Metro Rail and Mono Rail, out of which commuting by a Mono Rail has a proportion of 0.55. In such a situation, the choice of interest in using a Metro Rail, Mono Rail and private car would be respectively _____ .

[IES 2016]

  1. 0.45, 0.25 and 0.3
  2. 0.25, 0.45 and 0.3
  3. 0.3, 0.25 and 0.45
  4. 0.25, 0.3 and 0.45
Answer: Option D
Explanation:
The proportion of people using,
  • Private cars = 0.45
  • Public transportation = 1 - 0.45 = 0.55
Among 55% of public transportation users, the proportion of Mono Rail and Metro Rail users are 0.55 and 0.45 (i.e., 1 - 0.55) respectively.
  • Net proportion of Metro Rail users = 0.55 x 0.45 = 0.25
  • Net proportion of Mono Rail users = 0.55 x 0.55 = 0.30

30. The main drawback of automatic counters-cum-classifiers, used for traffic volume studies, is that it is not yet possible to classify and record _____ .

[IES 2019]

  1. Axle spacing
  2. Axle load
  3. Speed
  4. Vehicle type
Answer: Option D
Explanation:
Automatic counters-cum-classifiers ia a type of mechanical counter. Any mechanical counter can automatically record the total number of vehicles crossing a section of road but it is not possible to identify the different type of vehicles in a traffic stream.
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