Volume study (group 5)

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Information about Volume study (group 5)

Published on February 26, 2014

Author: elixireros

Source: slideshare.net

DEPERTMENT OF CIVIL ENGINEERING

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Traffic surveys are required to transportation engineers for :  planning and designing traffic facilities  determining the need for traffic control devices  studying the effectiveness of introduced schemes;  diagnosing given situations and finding appropriate solutions;  forecasting the effects of projected strategies;  calibrating and validating traffic models etc.

 Traffic Stream characteristics – volume, speeds, density, and occupancy studies etc.  Axle load survey  Capacity studies of streets and intersections  Travel demand – Home interview survey  Studies of road users cost  Parking supply and demand studies  Inventories of road-traffic physical features  Traffic accident studies  Environmental impact studies of transport  System usage studies

Traffic Volume Study

Objectives of Study Vehicle Composition Traffic Stream Properties Directional Distribution Flow Fluctuation Average Daily Traffic

 Traffic volume studies are conducted to determine the volume of traffic moving on the roads and classifications of roadway vehicles at a particular section during a particular time.  Volumes of a day or an hour can vary greatly, depending on the different day of the week or different time period of a day.  Traffic Volume survey is the determination of the number, movement and classifications of roadway vehicles at a given location.

 To determine vehicle composition during survey period  To determine service flow rate in PCU unit  To determine Directional Distribution of traffic  To estimate average daily traffic based on expansion factor  To draw partial flow fluctuation curve

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Design Traffic Stream Computin g Accident Rates Planning SCOPES Improvement Estimating Highway Use Dynamic Traffic Management

Volume/flow Rate of flow Average Daily Traffic (ADT ) Average Annual Daily Traffic (AADT) Design Hourly Volume Service flow rate Directional Distribution

Manual methods Combination of manual and mechanical methods Automatic devices Moving observer method Photographic method

Manual Counting Method • 1. Direct • 2. Indirect Automatic Counting Method • 1. Contact System • 2. Contact-less System Method Method

Manual Count Recording Method

Figure: Example Manual Intersection Volume Count Tally Sheet

Figure : Manual Counting Board

Electronic counting boards are battery-operated, hand-held devices used in collecting traffic count data. Figure : Electronic Counting Boards

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Portable Counters Videotape Permanent Counters:

Automatic Counting Method

Figure : Bending Plate

Figure : Pneumatic Road Tube

A device that is placed in a groove cut into the roadbed of the lane(s) being counted. This electronic counter can be used to measure weight and speed. Figure : Piezo-electric Sensor

The inductive loop detector (ILD) is the most common sensor used in traffic management applications.

Figure Count Vehicles Using Hand-Held Electronic Counter Boards.

A device that is placed in a groove cut into the roadbed of the lane(s) being counted. This electronic counter can be used to measure weight and speed. Figure : Piezo-electric Sensor

Data Collection

Survey Date : 24th November, 2013 Survey route : Russell Square to Panthapath Method : Equipment : Hand Counter , Pencil , Clip Board , Data Sheets No. of enumerator : 8 persons

Hand Counter Supply of blank field data sheets Pencils , erasers and pencil sharpner Clip boards.

 Reconnaissance survey and route alignment survey was carried out to acquire generalized idea about the survey area. This survey ensures the physical properties of location which cannot be authenticated by Google Earth Maps.

 Private car is predominant in this road .  Most available vehicle along this road is motorcycle.

 Two private hospital, Square Hospital and Shomorita Hospital, is situated alongside the road . So that traffic attraction is huge in this area.  No foot over bridge in this road .

Panthapath Intersection (Units in meter)

Panthapath Intersection (Units in meter)

Russel Square Intersection (Units in meter)

Russel Square Intersection (Units in meter)

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• • • • • • Figure : Hand Tally Counter

Number of Enumerator There were 8 enumerators in each group. Every enumerator was appointed to count one or more than one category of vehicle.

Data Analysis

 Vehicle Composition in Traffic Stream  Service Flow Rate in PCU/ PCE unit  ADT based on Expansion Factors  Directional distribution  Flow Fluctuation Curves

Station name: Russel Date : 31 May, 2012 Square to Panthapath Day : Thursday Survey group: Group 5 Time : 10:00 AM-10 : 20 Weather condition: Cloudy AM 10:00 -10 : 4 5 6 NMV 3 Light Vehicle (LV) Auto Rickshaw (AR) Motorcycle (MC) 2 Truck (T) Time Bus (B) Cycle 1 Total traffic in a cycle

Vehicle Composition of Traffic Stream Pie Chart for Vehicle Composition of Traffic Stream 14% 13% 24% 11% 60% 2% 0% Bus (B) Trcuk (T) Light Vehicle (LV) Auto Rickshaw (AR) Motorcycle (MC) NMV

Type of Vehicle Number PCE Converted number Bus (B) 8 3 24 Tract (T) 0 .75 0 Light Vehicle(LV) 203 1 203 Auto Rickshaw (AR) 47 .5 23.5 Motorcycle (MC) 43 .1 4.3 NMV 39 .5 19.5 Total 340 274.3

Traffic Flow (10:00-10:20 AM) 274.3 PCU Service Flow Rate (10:00-11:00AM) 823 PCU/hr From calculation it is found that the service flow rate of this corridor at 10:00am to 11:00 am was 823 PCU/hr. Again, level of service of a road can be determined from service flow rate. Level of service of a road can be classified according to service flow rate as below

LOS Service Flow Rate (PCU/hr) A 600 B 700 C 900 D 1200 E 1400 F >1400 According to this table the level of service of Panthapath road was, “C” at 10:00 am11:00 am in Thursday.

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Proportion of Directional Distribution of Traffic Flow 45% 55% 45% From Panthapath To Russell Square From Russell Square To Panthapath

Direction From Panthapath To Russell Square From Russell Square To Panthapath Time PCU/h 9:00AM10:00AM 899 961.67 78.38% 795.67 21.61% 860 10:00AM11:00AM Average PCU/hr Direction al Distributi on 11:00AM12:00AM 9:00AM10:00AM 10:00AM11:00AM 11:00AM- 1126 727 823

 According to directional distribution most of the vehicle travel towards Russell Square, as this road leads to the city center and the survey was made in the work going phase of the day, so directional distribution was justified.

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Flow Fluctuation Curve (PCU/hr vs. time curve) 1200 1125.6 1100 PCU/HR 1000 981.2 900 898.8 860.9 859.5 800 822.9 836.7 793.1 726.6 700 600 9:40-10:00 AM 10:00-10:20 AM From Panthopath to Russell Square 10:20-10:40AM From Russell Square to Panthopath Avg. PCU

Conclusions Recommendations Limitations

Conclusions

Discussion on Vehicle volume The vehicular volume using Panthapath road – Russell square road is important for understanding the efficiency at the system works at present and the general quality of service offered to the road users. The vehicle count has one cycle. It was a matter fact that number of vehicle counted in cycle cannot determine the highest number of vehicle passed through the survey location in the cycle of counting period.

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Thank you.

Dedicated this presentation to Sami Sir and Rafi Sir

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