Sri Lanka Institute of Information Technology
B. Sc. Eng (Honours) Degree
in
Civil Engineering
Mid-Semester Assessment
Year 4, Semester 1 (2020)
CE4411 – Traffic Engineering and Planning
Duration: 12 Hours
April 2020
Instructions to Candidates:
• This assessment has only ONE question.
• This is an Open-Book Examination.
• Plagiarism and Impersonation are punishable offences.
• Total marks for this paper is 100.
• This paper contains 3 pages including the cover page.
• Data set necessary for working the problem is given separately in the
Couse Web as an Excel File.
1
Submission Guidelines
1. Calculations and Assumptions made should be clearly stated.
2. The data corresponding to your index number should be shown at the
beginning of the answer.
3. Answers should be submitted in either of “JPEG/PDF/EXCEL” format.
4. Each student is allowed to submit ONLY ONE answer file under his/her
registration number.
5. The
answer
file
should
be
named
as
“CE4411_MIDASSIGNMENT_Your Registration Number”.
6. All submitted answers are subjected to Turnitin plagiarism check
7. Any submission after the deadline will NOT be accepted by any means.
2
Question 1
(100 marks)
You are given spot speeds of different vehicle categories (Motor Bikes: MB, Three-Wheelers:
3W, Car/Van/Jeep: CVJ, Busses: BUS, Medium Goods Vehicles: MGV, and Heavy Goods
Vehicles: HGV) collected from a speed survey using speed guns at an arterial road. The raw
data sheet gathered during the survey is given separately to you in Microsoft Excel format.
(a) Draw the histograms of the observed speeds for TWO VEHICLE CATEGORIES
assigned to you based on your registration number (see Table Q1) in the same graph.
(20 marks)
(b) Draw the cumulative frequency distribution diagrams of the observed speeds for the
SAME two vehicle categories as of question (a) above in the same graph.
(20 marks)
(c) Determine the following speed parameters for the selected two vehicle categories
separately.
i.
ii.
iii.
iv.
v.
vi.
vii.
Mean spot speed
Modal class
Mode or modal speed
Standard deviation
85th percentile speed
15th percentile speed
Median speed
(05 marks)
(05 marks)
(05 marks)
(20 marks)
(05 marks)
(05 marks)
(05 marks)
(d) Compare your two speed value parameters with the posted speed limits of the arterial road.
(Posted speed limits for light vehicles and heavy vehicles are 70 kmph and 60 kmph
respectively. However, for Three-Wheelers the posted speed limit is 40 kmph)
(10 marks)
Table Q1: Vehicle selection criterion based on the number assigned* to your registration number
Value of
‘m’
0
1
2
3
4
Vehicle
Type
MB
3W
CVJ
MB
3W
Value of
‘n’
0
1
2
3
4
Vehicle
Type
HGV
BUS
MGV
BUS
HGV
𝑁𝑢𝑚𝑏𝑒𝑟 𝐴𝑠𝑠𝑖𝑔𝑛𝑒𝑑 = 4𝑚 + 𝑛 ;
Select values for ‘m’ and ‘n’ fulfilling the below two inequalities and pick the
two vehicles assigned to you.
0 ≤ 𝑚 ≤ 4;
and 0 ≤ 𝑛 ≤ 4
Note: * number assigned against your registration number has already been uploaded to the course web
- End of the Question -
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