Post on 15-Apr-2017
transcript
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.
PRESENTED BYGROUP TWO
REZWAN HOSSAIN 11.01.03.152
MD ASHIKUL ISLAM11.02.03.034
AFRINA KHAN12.01.03.058
SHARMIN CHAKLDER12.01.03.083
M.S. RAHMAN12.01.03.089
RASHED ALAM12.01.03.098
Presentation Outline
Definition Objective Scope of Traffic Volume Study Keywords Related to Traffic Volume Study Methodology Data Collection & Analysis Limitation Recommendation
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.
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.
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.
Keywords Related To The Study
Volume/Flow Rate of Flow Volume Counts Average Daily Traffic (ADT) Average Annual Daily Traffic (AADT) Expansion Factors PCU
Methodology
Equipment Used For Manual Counting Method
Tally Sheet Clip Board Stop Watch
Equipment Used For Automatic Counting Method
Automatic Traffic Counter Pneumatic Tube Counter
Equipment Used For Automatic Counting Method
Inductive loops Weigh in Motion Sensor
Data Collection Location : Panthapath Signal to Russel Square
Signal.
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.
Data Collection Sheet
Types of Vehicle Number
Car, Jeep, Micro, Taxi 207
Three Wheeler 64
Bus 7
Motorcycle 39
NMT 101
Utility & Others 8
Data Analysis Calculation of Service Flow Rate(Group-2)Types of Vehicle No. of
Vehicles(Duration:2
0min)
PCUFactor
Flow (Duration:2
0 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 50.5 151.5Utility & Others 8 1.5 12 36
Total 979.2
Data Analysis (Continues) Level of Service : D
Composition of Vehicles:
Level of Service : D
49%
24%
2%
15%2%9%
Car, JeepNMTBus3 WheelerUtilityMotorcycle
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 ValueHourly Expansion Factor
(HEF)17.11
Daily Expansion Factor (DEF) 7.012
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
Data Analysis (Continues)
Directional Distribution:Direction Group No. PCU/hr Avg.
PCU/hrDirectiona
lDistributio
n
East to West
1 876
957 51%2 979
3 1014
West to East
4 980
945 49%5 1038
6 815
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%
Data Analysis (Continues)
Fluctuation Curve:
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.
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.
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.