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.