Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 5th Sem 3154008 Highway And Traffic Engineering Previous Question Paper
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?V (NEW) EXAMINATION ? WINTER 2020
Subject Code:3154008 Date:29/01/2021
Subject Name:Highway and Traffic Engineering
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Marks
Q.1 (a) State the merits of road transport over other modes of
03
transportation.
(b) Discuss briefly different road users' characteristics affecting
04
traffic performance.
(c) Draw a typical sketch of NH (Rigid pavement) in embankment.
07
Show its all components and boundaries. Describe their
significance.
Q.2 (a) Describe briefly various factors controlling the highway
03
alignment.
(b) Explain with sketch the Overtaking Manoeuvre and derive
04
expression for OSD.
(c) The speeds of overtaking and overtaken vehicles are 80 and 65
07
kmph respectively. If the acceleration of the overtaking vehicle
is 2.5 kmph per second, calculate the safe OSD for (i) One way
traffic, and (ii) Two way traffic.
Q.3 (a) Briefly explain with sketches Specific Gravity Test for the
03
aggregates.
(b) Explain following terms with a sketch of volumetrics of
04
bituminous mix: VMA, VFB, VV, Vba
(c) An ascending gradient of 1:40 meets a descending gradient of
07
1:50. Determine the length of summit curve to provide ISD, for
a design speed of 80 kmph. Assume all other data.
Q.4 (a) Briefly explain with sketches Softening Point Test for the
03
bitumen.
(b) Briefly describe with sketches `Marshall Stability Test' for
04
bituminous mix design.
(c) The CBR test carried out on a subgrade soil gave the following
07
readings.
Penetration Load Penetration Load Penetration Load
(mm)
(kg) (mm)
(kg) (mm)
(kg)
0
0
2.0
43.0 5.0
78.0
0.5
3.5
2.5
54.0 7.5
94.5
1.0
14.5 3.0
60.0 10.0
104.5
1.5
32.0 4.0
72.0 12.5
112.4
Determine the CBR value of soil sample
Q.5 (a) Briefly describe: ESWL, EWLF, BUC
03
(b) Determine the total thickness of flexible pavement assuming
04
single layer elastic theory and using the data: Design wheel
1
load = 5100kg, Tyre pressure=7kg/cm2, Elastic modulus=
160kg/cm2, permissible deflection=0.25cm.
(c) Design a suitable bituminous pavement section for a two-lane
07
road with a Single carriageway. The traffic expected is 520
commercial vehicles per day in both directions with average
vehicle damage factor of 1.6. Design subgrade CBR is 5%. The
assumed design life of the pavement is 10 years. Use
Guidelines, graphs and plate of IRC 37-2001.
Q.6 (a) Describe with sketches special considerations for Hill Roads
03
construction.
(b) Discuss with sketches any three types of failures and its
04
remedial measures in rigid pavements.
(c) Calculate the stress at corner region of cement concrete
07
pavement using Westergaard's stress equation modified by
Kelly.
Take wheel load = 5000 kg, Ec = 3 x 105 kg/cm2 , Pavement
thickness = 19 cm, ? = 0.15, Modulus of subgrade reaction k =
5 kg/cm3, Radius of contact area = 15 cm.
Q.7 (a) Derive Greenshield's equations for maximum flow condition.
03
(b) Explain with sketch `Enoscope method' of Spot-Speed study.
04
(c) From the following data of spot-speed study, draw graphs for
07
frequency (%) ?vs- Speed range and Cumulative frequency
(%) - vs- Speed. Determine TMS, SMS, Speed for traffic
regulation.
Speed
1-
11- 21- 31- 41- 51- 61- 71- 81-
range
10 20
30
40
50
60
70
80
90
(kmph)
No. of 7
11
18
25
32
24
16
10
6
vehicles
Q.8 (a) Briefly describe: Traffic density, Time headway, Basic
03
Capacity
(b) Explain with sketches: Rotary Intersection, Full Cloverleaf
04
Interchange.
(c) On the right angled crossing of four arm signalized
07
intersection, design 4 phase signal cycle for the given data
using Webster's method and IRC recommendations. Assume,
amber = 3 sec/phase, lost time = 2 sec/phase, saturation flow
rate=600W [W= Width of approach (m)], pcu value for the left
and right turning vehicles are 25% and 75% more respectively.
All left (L), straight (S) and right (R) turning vehicles on an
approach are allowed to depart simultaneously during a green
interval. Road AB crosses road CD at right angle.
Approach
A
B
C
D
Width
10
10
9
9
(m)
Turning
L
S
R
L
S
R
L
S
R
L
S
R
Volume
400
900
300
300
800
150
100
480
60
120
450
60
(pcu/hr)
2
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This post was last modified on 04 March 2021