GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018
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Subject Code: 2170613 Date: 15/11/2018Subject Name: Traffic Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
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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 affect road features ? 04
(c) A test car was used on a north-south road 0.75 km long, and the following data, for the moving car was collected. 07
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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
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2 2.70 83 3 23 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
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no. time(along) | vehicles met | vehicles vehiclesin min against overtaking | overtaken
test car by test car
1 2.33 110 2 0
2 2.71 115 0 2
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3 2.48 120 0 04 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
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(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/sec?, 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
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3. Frontal area of vehicle : 3.5 m?4. Coefficient for air resistance : 0.40 kg/m?
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.
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dV/dt = 1.22 - 0.015V
Where, V is speed in m/sec and t is time in sec
(1) The maximum speed of vehicle.
(2) The maximum rate of acceleration.
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(3) The rate at which the vehicle is accelerating after 3 seconds given byQ.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
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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
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(b) Find Time mean speed and space mean speed from following data. 04Speed range(kmph) Frequency
0-10 8
10-20 18
20-30 26
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30-40 3040-50 18
(c) What is the importance of highway lighting ? State the factors influencing 07
night visibility.
OR
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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
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(1) Single side of road(ii) Both side of road(staggered)
(iii) Central
(iv) At T intersection
(v) At cross.roads
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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
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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
(1) Partial clover leaf intersection
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(ii) Full clover leaf intersection.(iii) Diamond interchange.
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