1. Welcome To The Presentation On
TRAFFIC VOLUME STUDY
COURSE NUMBER : 452
COURSE NAME : TRANSPORTATION ENGINEERING LAB-II.
COURSE TEACHERS : MD. MINHAJUL ISLAM KHAN,
MD. ARMAN CHOWDHURY.
2. PRESENTED BY
GROUP TWO
REZWAN HOSSAIN 11.01.03.152
MD ASHIKUL ISLAM 11.02.03.034
AFRINA KHAN 12.01.03.058
SHARMIN CHAKLDER 12.01.03.083
M.S. RAHMAN 12.01.03.089
RASHED ALAM 12.01.03.098
3. Presentation Outline
Definition
Objective
Scope of Traffic Volume Study
Keywords Related to Traffic Volume Study
Methodology
Data Collection & Analysis
Limitation
Recommendation
4. Definition
What is traffic volume studies:
Traffic volume study means determining the number,
movement and Classification of Roadway vehicle at a given
location or point of traffic stream. So it is defined as the
procedure to determine mainly volume of traffic moving on
the roads at a particular section during a particular time.
5. Objectives of Traffic Volume Study
General Objectives:
Geometric Design.
Roadway traffic Design.
Planning Purpose.
Improvement Purpose.
Dynamic traffic management purpose.
Specific Objective:
Determination of vehicle composition in traffic stream.
To determine service flow rate in PCU/PCE unit.
Estimation of Average daily traffic (ADT) using expansion factors.
To determine directional distribution (DD).
To illustrate flow fluctuation curves.
6. Scope of Traffic Volume Study
Magnitudes, classifications and the time and
directional split of vehicular flows.
Proportions of vehicles.
Hourly, daily, yearly and seasonal variation
of vehicular flows.
Flow fluctuation on different approaches at a
junction.
7. Keywords Related To The Study
Volume/Flow
Rate of Flow
Volume Counts
Average Daily Traffic (ADT)
Average Annual Daily Traffic (AADT)
Expansion Factors
PCU
13. Data Collection (Continues)
Date : 17th December,2015.
Time : 10:00am-10:20am.
Weather Condition : The Sky Was Party Clear.
Counting Method: Direct Manual Method.
Equipment : Stop watch, Tally Sheet, Clip Board.
No. of Enumerators : Six Persons.
14. Data Collection Sheet
Types of Vehicle Number
Car, Jeep, Micro, Taxi 207
Three Wheeler 64
Bus 7
Motorcycle 39
NMT 101
Utility & Others 8
15. Data Analysis
Calculation of Service Flow Rate(Group-2)
Types of Vehicle No. of Vehicles
(Duration:20
min)
PCU
Factor
Flow
(Duration:20
min)
Service Flow
Rate
(PCU in 1 Hour)
Car, Jeep, Micro, Taxi 207 1 207 621
Three Wheeler 64 0.5 32 96
Bus 7 3 21 63
Motorcycle 39 0.1 3.9 11.7
NMT 101 0.5 50.5 151.5
Utility & Others 8 1.5 12 36
Total 979.2
16. Data Analysis (Continues)
Level of Service : D
Composition of Vehicles:
Level of Service : D
48%
24%
2%
15%
2%
9% Car, Jeep
NMT
Bus
3 Wheeler
Utility
Motorcycle
17. Data Analysis (Continues)
Estimation Average Daily Traffic (ADT) Based on
Expansion Factor:
Estimated 24 hour volume for Thursday using HEF
= (989.2*17.11+876*18.80+1014*18.52)/3 = 17334.10 PCU
From 24-hour volume data for Thursday, the estimated volume for
the week using DEF (Daily Expansion Factor), total 7 days’ volume
= (17334.10*7.012) PCU
= 121546.46
Factor Value
Hourly Expansion Factor (HEF) 17.11
Daily Expansion Factor (DEF) 7.012
18. Data Analysis (Continues)
So, ADT for (24 hour volume) East to West Direction-
= 121547/7
= 17363.78 PCU
**N.B. – Daily Expansion Factor for Thursday is 7.012.
Calculation of Annual Average Daily Traffic (AADT):
The AADT is given by,
AADT = ADT*Monthly Expansion Factor
= (17363.78*1.756) PCU; [Monthly expansion factor= 1.756]
= 30490.80 PCU
19. Data Analysis (Continues)
Directional Distribution:
Direction Group No. PCU/hr Avg. PCU/hr Directional
Distribution
East to West
1 876
957 51%2 979
3 1014
West to East
4 980
945 49%5 1038
6 815
20. Data Analysis (Continues)
% ADT Calculation:
Time East-
West
West-
East
E-W ADT W-E ADT E-W
%ADT
W-E
%ADT
9-10 876 980
17363 17122
5.1% 5.72%
10-11 979 1038 5.64% 6.1%
11-12 1014 815 5.84% 4.76%
22. Limitation
This volume study was practiced by un-skilled enumerators,
which may lead to some error in data collection process.
Data were collected for 20 minutes by each group, although it is
assumed that the data collected for three hours actually it is
counted for only one hour which may not represent the hourly
fluctuation of traffic.
AADT was calculated using expansion factors. These expansion
factors established based on data collected in a rural road of
AASHTO, the actual daily expansion factors will be much
different from what is used. So they will not give actual ADT.
Data collected by manual method of counting, which is unreliable
and irreversible.
23. Recommendation:
Trained and skilled enumerators should collect data
which is first requirement of Manual counting.
Automatic counting system should be introduced for
more reliable data.
Actual expansion factor should be introduced for
Dhaka city.
For design purpose minimum 3 days Data should be
collect.
Before final survey reconnaissance survey or pilot
survey is necessary.
24. Special Observation
All the procedure, methods, equipment were recommendation
from AASHTO(American Association of State Highway and
Transportation Officials). As the roadway condition, vehicle
types, users, surrounding areas, weather all the things are different
from the AASHTO code, so we should develop our own code or
follow the neighboring country’s code.
