Presentation on Traffic Volume Survey
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This document summarizes a traffic volume study conducted at Tejgaon Industrial Area in Dhaka, Bangladesh. A team of 5 students conducted classified manual counts of vehicles traveling along Shaheed Tajuddin Ahmed Avenue between Shatrasta and the flyover for 15 minutes intervals. Over 5,000 vehicles were counted, with the highest percentages being cars (54%) and CNG auto-rickshaws (22%). The average service flow rate was higher for traffic traveling from Shatrasta to the flyover compared to the opposite direction, reflecting peak travel patterns. Directional splits showed 55% of total traffic traveled from Shatrasta to the flyover.
Presentation on Traffic Volume Survey
- 1. Department of Civil Engineering AHSANULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY 1
- 2. This Presentation is done as a requirement of a Sessional Course- CE-452 TRANSPORTATION ENGINEERING SESSIONAL II 2
- 3. To engineer transport mode or traffic system the most important factors are- 1.The available traffic volume and its capacity, 2.The necessary speed of vehicles to provide continuous traffic maneuvers, 3.The different parameters that controls and effects roadway conditions. So basic study area should be comprised of as follows :- 3
- 4. In this case, our study subject is ---------- Traffic Volume Study 4
- 5. This will be presented by- GROUP NO.07 Name Student ID Muhib Muazzam Bakhtiar Omar Omi Yeasin Talukder Md. Firoz Mahmood Ovi Shaibal Ahmed 09.02.03.044 09.02.03.045 09.02.03.046 09.02.03.047 09.02.03.049 5
- 6. Let’s have a background check on the condition of vehicles in Capital of Bangladesh Dhaka City--General Information Area 815.85 sq. km (approx) Population 7 million (approx.) Temperature Summer: max 36.7°C & min 21.1°c Winter : max 31.7°C & min 10.5°c Rainfall 2540 mm annually. Humidity 80 percent (approx.) Transport Sectors &Vehicle distribution of Dhaka City is as follows- 6
- 7. Income-wise use of different Transports High Income Group (HIG) Car, Taxi Service, Micro Bus and other private vehicles. Medium Income Rickshaw, Auto Rickshaw, Group (MIG) Bicycle, Motor Cycle, Carriage, Car, Bus, Minibus Low Income Group (LIG) HIG GD LIG Bus and Tempo Good Delivery (GD) MIG Pick up, Van, Human Driven Van Relative Vehicular Distribution in Dhaka City 7
- 8. 1. 2. 3. 4. 5. Objective To determine of vehicle composition in traffic stream. To determine of service flow rate in PCU/PCE unit. To estimate of ADT based on expansion factors. To determine directional distribution(DD). To draw flow fluctuation curves. Scope of The Test Magnitudes, classifications and the time and directional split of vehicular flows; Proportions of vehicles in traffic stream; Hourly, daily, yearly and seasonal variation of vehicular flows; Flow fluctuation on different approaches at a junction or different parts of a road network system. 8
- 9. To define Traffic Volume study various parameters need to be introducedTotal number of vehicles that pass over a given point or section of a lane or roadway during a Vehicle/Flow given time interval •The equivalent hourly rate at which vehicles passing over Rate of Flow •Time interval less than 1hr. Usually 15 min Service Flow Rate •The maximum hourly rate of a roadway section •Time interval any given period under prevailing roadway condition Average Daily traffic (ADT) Represent a 24-hour count at any specified location Annual Average Daily Traffic (AADT) Represent the average 24-hour traffic volume at a given location averaged over a full 365-day year There are 3 expansion factors. They areExpansion Factors Hourly Expansion Factors (HEF ) ; Daily Expansion Factors (DEF ) ; Monthly Expansion Factors (MEF ). 9
- 10. Capacity : Capacity is defined as the maximum number of vehicles, passengers, or the like, per unit time, which can be accommodated under given conditions with a reasonable expectation of occurrence. Capacity is independent of the demand. It speaks about the physical amount of vehicles and passengers a road can afford. Level Of Service: A term closely related to capacity and often confused with it is service volume. When capacity gives a quantitative measure of trac, level of service or LOS tries to give a qualitative measure. A service volume is the maximum number of vehicles, passengers, or the like, which can be accommodated by a given facility or system under given conditions at a given level of service. 10
- 12. Study Location Study Zone : Tejgaon; Industrial Area Population : 2,20,012 Area : 8.75 km² Household: 37,644 Study Road : SHAHEED TAJUDDIN AHMED AVENUE Length : 0.560 km Lanes : 3 lanes both direction; each 13 ft approximately Width : 42 ft at intersection of SAATH RASTA 44 ft at intersection of FLYOVER 12
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- 14. Before proceed to vehicle counting it is customary to do• Pilot Survey, •Reconnaissance Surveys. From our Reconnaissance Surveys we found that• At Saath Rasta intersection there was a construction going on for a fly over . • Most of the buildings are there educational & official. • Around the metal sculpture there are about 7 manholes & about 15 potholes. • At median there are 6 median openings including both ends. • At footpath there is more than enough manholes. • Along flyover to saath rasta ther is 5 and along saath rasta to flyover there is 4 local roads. • Along saath rasta to flyover there is 2 gas station and 1 filing station • On street parking is common in both direction. •At Saath Rasta vehicles are actuated manually by TRAFFIC POLICE. • Although a signal actuated intersection, Fly Over intersection is manually controlled. 14
- 15. Conditions & Specifications Location: Shatrasta to flyover Station: In front of BG Press Date: 20th June 2013(Thursday) Time: Time of data collection 8:30 am to 8:45 am Weather Condition: Sunny Observation: Classified Vehicle Counts Method: Direct Manual Method Duration: 15 minutes(Short Count) Equipment: Stop watch, Pencils, Eraser, Tally sheet(Field Data Sheet), Clip board Number of Enumerators: Five 15
- 16. • Before the day of counting we had gone to our location for a reconnaissance survey and locate necessary reference buildings. • On the promised day, we reached our station and observed the various vehicles that went by and distributed specified vehicles among our 5 Enumerators to count them for 15 minutes Procedure of Works • We use tally to lessens our clumsiness and error of counting. • After 15 minutes we counted the total vehicles of each types. • Finally we prepared a field observation data sheet and filled the necessary data. 16
- 18. Problems in counting X Position of Enumerators Y Saatrasta To Flyover X Y
- 19. Problems in counting(Continued) X Position of Enumerators Y Saatrasta To Flyover X Y
- 20. Steps of Data Collection & Synchronization: Step 1 : Count the vehicle by means of manual method in this tally sheet method. Step 2 : Collect & Divide it in various types of vehicles. Step 3 : Record values obtained in field survey book or any notebook. Step 4 : Calculate different parameters that is related to volume studies. Step 5 : Input the collected or calculated values according to suitable time intervals. Step 6 : Check if necessary requirements are fulfilled by data archive & results. Formulae: SRF=Total Counted Vehicle Manually or Automatically in an Interval*4 TV=Total Converted Vehicles or PCU*4 HEF=17.11 TDV=TV*HEF DEF=7.012 TWV=TDV*DEF ADT=TWV/7 AEF=1.395 AADT= ADT*AEF. Percentage of any value = 20
- 21. Arbitrary Specifications And Abbreviations: F-S = Flyover to Saath Rasta. S-F = Saath Rasta to Fly Over. PCE = Passenger Car Equivalent : A Passenger Car Equivalent is essentially the impact that a mode of transport has on traffic variables (such as headway, speed, density) compared to a single car. PCU = Passenger Car Unit. Time Intervals Used Time Intervals for Flow SFR = Service Flow Rate. Fuctuation TV = Total Volume. 9:00-10:00AM TDV = Total 24 Hour or Daily Volume. 8:15-8:30AM TWV = Total 7-Days or Weekly Volume. 10:00-11:00AM 8:30-8:45AM ADT = Average Daily Volume. AADT = Annual Average Daily Volume 11:00-12:00AM 8:45:9:00AM DD = Directional Distribution. 12:00-1:00AM TAF = Total Annual Flow. 9:00-9:15AM SD = Standard Deviation. 1:00-2:00AM VPH = Vehicle Per Hour or veh/hr. 9:15-9:30AM VPD = Vehicle Per Day or veh/day. RHD = Roads and Highway Department. AASHTO = American Association of State Highway And Transportation Officials. TYPE I = Car, Jeep, Micro, Taxi. TYPE II = 3-wheeler. TYPE III = Bus. TYPE IV = Motorcycle. TYPE V = NMT = Non-Mechanized Transport. TYPE VI = Utility & others 21
- 22. Data Synchronization for Flow Fluctuation For Traffic Along Fly Over to Sath Rasta Between 8:30-8:45AM TCV for Type I vehicle is 262 whose PCE=1 PCU = 262*1 = 262 Between 8:30-8:45AM TCV = 511; So, SFR = TCV*4 = 2044. PCU = 475; So, TV = PCU*4 = 1900. TDV = TV*HEF =1900* 17.11= 32509. TWV = TDV*DEF = 32509*7.012 = 227953. ADT = TWV/7 = 227953/7 = 325695. AADT = ADT*1.395 = 25695*1.395 = 45427.8. 22
- 23. For Traffic Along Sath Rasta to Fly Over 23
- 24. Directional Distribution For Total Vehicular Split % By 137787 % By SFR Along F-SDirection total ADT = TV Direction Along S-F Direction total45 = 168274 44 ADT F-S % ADT along F-S = 137787/(137787+168274) = 45% S-F 55 56 % ADT along S-F = 168274/(137787+168274) = 55% % By ADT 45 55 For Individual Vehicular Split 24
- 25. Total Vehicular Distribution On the Study Location Type I Type II Type III Type IV Type V Type VI F-S 1136 500 181 278 98 4 S-F 1550 615 164 395 47 42 total 2686 1115 345 673 145 46 5010 % Vehicle 54% 22% 7% 13% 3% 1% 100% PCE 1 0.5 3 0.1 0.5 1 Sum of Counted %PCU Vehicles 60% PCU 2686 557.5 1035 67.3 72.5 46 4464.3 12% 23% 2% 2% 1% 100% 25
- 26. Flow Fluctuation for Individual Vehicular Split Along F-S 26
- 27. Along S-F 27
- 28. Is Bangladesh really a developing country? 28
- 29. Result Analysis & Discussion • Result is the most critical part in a survey or project or data-based research. • Result decides or gives an overview on whether the value we have got or collected is good or insufficient to go further in our research.
- 30. Result Analysis & Discussion(continued) Comparison of Service Flow Rate (SFR) Along Flyover - Shatrasta Total SFR Avg. SFR For 1hr & 15 min. 8788 vph 1757.6 vph Along Shatrasta - Flyover Total SFR Avg. SFR For 1hr & 15 min. 11252 vph 2250.4 vph
- 31. Reason for increasing SFR along Shatrasta to Flyover Leguna • Farmgate to Nabisco • Follows one way route Route used • Shatrasta • Nakhalpara
- 32. Reason for increasing SFR along Shatrasta to Flyover(continued)
- 33. Comparison of ADT & % of Vehicle along S-F & F-S Direction •In the pie charts of %DD it is seen that direction S-F has the greater value. •In the pie charts for vehicle composition it is seen that there is always greater percentage of private transport(Car, Jeep or micro) than public transport(bus).
- 34. Comparison of Total ADT of assumed 1hr interval
- 35. Conclusion & Recommendation SFR may be increased by Increasing • Lane width • Lateral clearances • Free-flow speed Implementing • Smoother terrain • Selection of geometric design for an intersection Performing diverging & weaving analysis A separate lane for NMT may be deployed to remove congestion.
- 36. Conclusion & Recommendation(continued) • Traffic volume counting should be automatic and most importantly contactless method as it is not clumsy. • Before final survey reconnaissance survey or pilot survey is necessary. • Choose a vintage point; if not possible then select a reference station. • In case of manual counting try to keep a hand counting machine. • Wear retro-refractive dresses.
- 37. Thank you for your attention ANY QUESTIONS ?
Editor's Notes
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