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Traffic Engineering Exam Paper

This document contains a traffic engineering exam from Gujarat Technological University. It includes 5 questions covering various topics in traffic engineering. Question 1 involves calculations related to traffic volume, travel time, and speed using data collected from test trips along a 0.75 km road. Question 2 covers physical factors affecting road users, traffic volume count surveys, and calculations of vehicle acceleration and resistance on gradients. Question 3 defines traffic signal terms and covers signal design methods. Question 4 involves spot speed studies, calculations of mean speed, and the importance of highway lighting. Question 5 covers lighting terminology, advantages/disadvantages of overpasses, and sketches of interchange types.

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Ujjval Solanki
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120 views2 pages

Traffic Engineering Exam Paper

This document contains a traffic engineering exam from Gujarat Technological University. It includes 5 questions covering various topics in traffic engineering. Question 1 involves calculations related to traffic volume, travel time, and speed using data collected from test trips along a 0.75 km road. Question 2 covers physical factors affecting road users, traffic volume count surveys, and calculations of vehicle acceleration and resistance on gradients. Question 3 defines traffic signal terms and covers signal design methods. Question 4 involves spot speed studies, calculations of mean speed, and the importance of highway lighting. Question 5 covers lighting terminology, advantages/disadvantages of overpasses, and sketches of interchange types.

Uploaded by

Ujjval Solanki
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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Seat No.: ________ Enrolment No.

___________

GUJARAT TECHNOLOGICAL UNIVERSITY


BE - SEMESTER–VII (NEW) EXAMINATION – WINTER 2018
Subject Code: 2170613 Date: 15/11/2018
Subject Name: Traffic Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Define : operating speed, design speed, space mean speed. 03
(b) How do different vehicular characteristics affects road features ? 04
(c) A test car was used on a north-south road 0.75 km long, and the following 07
data, for the moving car was collected.
North trip Travel No. of No of No of
no. time(along) vehicles met vehicles vehicles
in min against overtaking overtaken
test car by test car
1 2.65 85 1 0
2 2.70 83 3 2
3 2.35 77 0 2
4 3.00 85 2 0
5 2.42 90 1 1

South trip Travel No. of No of No of


no. time(along) vehicles met vehicles vehicles
in min against overtaking overtaken
test car by test car
1 2.33 110 2 0
2 2.71 115 0 2
3 2.48 120 0 0
4 2.54 125 1 1
5 2.16 105 0 2
Calculate traffic volume, average travel time and space mean speeds in both
directions.
Q.2 (a) Explain (any three) physical factors of road user. 03
(b) Explain about classified traffic volume count survey with observation table. 04
(c) A vehicle is accelerating on an upward gradient of 1.5 % with a rate of 07
0.8m/sec2, from initial speed of 15 to 25 km/h. Calculate various resistances
encountered by the vehicle using following data :
1. Mass of vehicle : 1500 kg.
2. Coefficient for rolling resistance : 0.02
3. Frontal area of vehicle : 3.5 m2
4. Coefficient for air resistance : 0.40 kg/m3
OR
(c) A driver travelling at 50 km/hr behind another vehicle decides to overtake it 07
and presses the accelerator. The accelerating behavior of the car is described
by the following equation.
𝑑𝑉
= 1.22 - 0.015 V
𝑑𝑡

Where, V is speed in m/sec and t is time in sec


1
Determine:-
(1) The maximum speed of vehicle.
(2) The maximum rate of acceleration.
(3) The rate at which the vehicle is accelerating after 3 seconds given by
𝑑𝑉
= (α – βV0) e-βt
𝑑𝑡

Q.3 (a) Define with respect to traffic signal : phase, lost time, red interval 03
(b) Explain trial cycle method of signal design. 04
(c) What are the advantages and disadvantages of providing traffic signals? 07
OR
Q.3 (a) Define with respect to traffic signal : cycle, cycle length, interval, 03
(b) Explain Webster’s method of signal design. 04
(c) Draw at least 5 signs of each (not to scale) 07
Regulatory signs, Warning signs and Informatory signs.
Q.4 (a) Explain enoscope method of spot speed study. 03
(b) Find Time mean speed and space mean speed from following data. 04
Speed range(kmph) Frequency
0-10 8
10-20 18
20-30 26
30-40 30
40-50 18
(c) What is the importance of highway lighting ? State the factors influencing 07
night visibility.
OR
Q.4 (a) Enumerate with an example about intersection delay count survey. 03
(b) Calculate Time mean speed and Space mean speed from the following 04
spot speed observations in km/hr.
50,40,60,54,45,31,72,58,43,52,46,56,43,65,33
(c) Draw layout of lighting on 07
(i) Single side of road
(ii) Both side of road(staggered)
(iii) Central
(iv) At T intersection
(v) At cross roads
Q.5 (a) Define: Luminous flux, foot candle, Luminaire 03
(b) State advantages and disadvantages of over-pass or flyover. 04
(c) Draw a neat sketch of rotary intersection, show all design components and 07
explain about them in brief.
OR
Q.5 (a) Indicate and explain how spacing of street lighting is decided. 03
(b) Prepare a check list of facilities to be provided at any terminal. Justify your 04
answer for each of facility to be provided.
(c) Draw a neat sketch of 07
(i) Partial clover leaf intersection
(ii) Full clover leaf intersection.
(iii) Diamond interchange.

*************

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