TRAFFIC VOLUME STUDY

Ahmed Ferdous1004137

Department of civil engineeringBangladesh University of Engineering and Technology

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.

Determining vehicle composition of traffic stream Determining service flow rate Determining directional distribution Peak hour flow Estimating average annual daily traffic AADT based on expansion factors Drawing flow-fluctuation curve

OBJECTIVES:

IMPLICATION:

IMPLICATION

Design

Planning

Improving

Dynamic Traffic

Management

Estimating Use

Computing Accident

Rates

Traffic Stream

Methodology:

Traffic volume study

Automatic Counting Method

Manual Counting Method

Contact system based

Contactless system based

Direct method

Indirect method

Manual method:• Can be readily used• Easy classifying and

proportioning• Erroneous for long term

period and high volume

Automatic method:• Long duration suitability• Permanent station• Online data processing• Erroneous in non lane

based traffic• High initial cost• Problem in classifying

SHORT DURATION COUNT:MAINTENANCE,IMPROVEMENT

LONG DURATION COUNT:PLANNING,DESIGN

APPROACH:• RUSSEL SQUARE TO PANTHAPATH INTERSECTION

• GROUPED NUMERATORS• MANUAL COUNTING: Hand Counter, Tally Sheet, Clip board • Short count of fifteen minutes

Data collection

• DATA ANALYSIS:MOST IMPORTANT PHENOMENA-VEHIVLE COMPOSITION

Bus (B)2%

Truck (T)0%

Light Vehicle (LV)49%

Auto Rickshaw (AR)11%

Small Public-trans-port (SP)10%

Motor Cycle (MC)10%

NMV20%

VECHILE COMPOSITION(%)

• PREDOMINATE TYPE IS LIGHT VEHICLE

• HEAVY VEHICLE IS RARE• NMV COMPOSITION IS

PRETTY HIGH FOR THIS TYPE OF ROAD

group 5 group 40

50

100

150

200

250

300

350

400

Directional distribution(pcu)PC

U

• FOR RUSSEL SQUARE TO PANTHAPATH ROAD DISTRIBUTION FACTOR IS .6 AND .4 FOR OPPOSITE

• FOR DIFFERENT TYPES THIS RATIO VARIES FROM .45 TO.6

• FOR PREDOMINATE TYPE VEHICLE THIS RATIO IS NEARLY .5

0 5 10 15 20 25 30 35 40 45 500

50

100

150

200

250

300

350

400

450

500

bus truck L.Vcng+Sheet4!$F$2 spt m.bike

9.45 10 10.15 10.30 11 11.30

PCU

Time variation:

• MAINLY LV CHANGES WITH TIME

• SMALL PUBLIC TRANSPORT GET INCREASED AFTER FIXED PERIOD

ADT : The equivalent hourly traffic flow measured in less than one hour

GROUP Flow rate EXP. FAC 7day volume ADT

1 1563.2 7.012 10961.16 1565.88

2 856.8 7.012 6007.882 858.2688

3 1430 7.012 10027.16 1432.451

4 993.6 7.012 6967.123 995.3033

5 1462.4 7.012 10254.35 1464.907

6 1064.8 7.012 7466.378 1066.625

7 1023.2 7.012 7174.678 1024.954

8 1610 7.012 11289.32 1612.76

ON AVERAGE 1100 PCU IN EACH DIRECTION

• AADT: Total yearly volume divided by number of days

Exp.FAC AADT 1 DIRECTION

AADT 2 DIREC Average2375

0.948 1484.454

0.948 813.6388 3013.29

0.948 1357.964 1785.2

0.948 943.5475 2369

0.948 1388.732 2332.2

0.948 1011.161

0.948 971.6564

0.948 1528.896

AADT ON AVERAGE 2375

FLOW RATE 2456PCU/DAY

Panthopath to rassel square

Rassel square to panthopath

total

total pcu 248.4 365.6 614elapsed time 15 15 15Flow rate(pcu/day)

993.6 1462.4 2456

FLOW FLUCTUATION:

5 10 15 20 25 30 35 40 450

100

200

300

400

500

600

700

800

900

GR 5GR 4COM-BINED

PCU

AXIS SHOWS TIME LAGDATA @ 9.30,10,10.30,11,11.30 AM

• NOW HEARTBIT PEAK LIKE URBAN TRAFFIC PATTERN

• TREND IS NOT SAME FOR BOTH DIRECTION

SUMMARY:• Percentage of light vehicle is high• ADT AND AADT IS 1100 & 2375• FLOW RATE IS 2456 PCU/DAY• DIRECTIONAL DISTRIBUTION .6: .4• FLOW FLUCTUATION IS PRESENT

RECOMMANDATION:• RUN A SHORT TERM TEST SURVEY• USE 1ST FLOOR FOR BETTER VIEW• IMPLY MORE MANPOWER FOR LIGHT VEHICLE COUNT

QUESTION?

THANK YOU