Traffic Information Surveys
Chapter – 4
PRELIMINARY SURVEYS AND DATA COLLECTION
In the chapter 3, we have discussed about the aim and methodological analysis adopted for the work. In this chapter, traffic studies which are to be conducted and the demand of the studies for explicating the indexes of the mobility are briefly explained. The chapter is organized into two parts which consists of, Preliminary studies are conducted for the informations aggregation and the 2nd portion consists of secondary informations aggregation, which is obtained from assorted beginnings.
4.1. Traffic Surveies
The undermentioned preliminary studies were conducted for developing index.
- Traffic volume count study
- Speed and hold surveies
- Road stock list study
- Opinion study
4.1.1. Traffic volume count study
Traffic volume count studies are conducted to acquire the accurate values and information about the sum of vehicles go throughing through the study country.
Need of traffic volume count study:
Traffic volume count studies are used to: [ 6 ]
- Traffic tendencies can be established by mensurating the traffic volume.
- To find the one-year travel clip in vehicle kilometres for the bing system and based on it economic justification can be provided for new proposals.
- Highway user costs, grosss can be estimated.
In the present survey, classified volume count studies were conducted at the beginning and the finish of the identified stretch
Need for Classified volume count study: [ 6 ]
- Components of Geometric design of main roads such as breadth of lanes, design of inclines, clearances for overhead constructions ; classs etc. are dependent on the categorization of the vehicles and its volume on the route.
- Pavement deign, design of Bridgess and design of other substructure installations on the route requires informations about classified volume count.
- Volume to the capacity, normally termed as V/C ratio can be determined merely on the footing of classified volume count.
- Classified volume count at peak hours throws visible radiation on the lacks of the systems
- To supply justification for the regulative steps such as, one-way streets, routing of traffic, parking installations.
Traffic volume informations is really much of import in traffic, deign, planning, operation and research intents. Traffic volume Count Survey is conducted at identified midblock for 8 hours of the twenty-four hours covering both forenoon and eventide extremum and off-peak hours.
Behavior of the study:
Manual traffic counts were conducted at the identified midblock of beginning ( Sunkadakatte ) and finish ( K.R.Puram ) of the stretch selected for 8 hours of the twenty-four hours. At each midblock, both directional classified traffic volume count study were conducted for the computation of public presentation indexs.
Analysis of the informations:
The traffic volume count informations collected from the field is scrutinized and the values are analyzed, where the information is analyzed. The entire volume is converted to Passenger auto units ( PCU ) as per IRC: 106-1990 to find the volume of the route to its capacity given in the codification.
|
Vehicle Type |
Equivalent PCU factors- Percentage composing of vehicles type in traffic watercourse |
|
|
Fast Vehicles |
5 % |
10 % and above |
|
1. Two Wheeler motor rhythm / scooter |
0.5 |
0.75 |
|
2. Passenger auto, choice – up new wave |
1.0 |
1.0 |
|
3. Auto-rickshaw |
1.2 |
2.0 |
|
4. Light commercial vehicle |
1.4 |
2.0 |
|
5. Truck or Bus |
2.2 |
3.7 |
|
6. Agricultural Tractor Trailer |
4.0 |
5.0 |
|
Slow vehicles |
||
|
7. Cycle |
0.4 |
0.5 |
|
8.Cycle jinrikisha |
1.5 |
2.0 |
|
9. Tonga ( Horse drawn vehicles ) |
1.5 |
2.0 |
|
10. Hand cart |
2.0 |
3.0 |
Table 4.1: PCU factors for assorted types of vehicles [ 7 ]
( Beginning: Table 1: Recommended PCU factors for assorted types of vehicles on urban roads. IRC: 106-1990 [ 7 ] )
End product of the survey:
The obtained PCU/HR for both Peak and off–Peak hours are analyzed and the
Volume/Capacity is calculated for the finding of the public presentation index.
4.1.2. Speed and hold surveies
Travel velocity is reciprocally relative to go clip. The travel clip survey provides informations for the sum of clip required to track a specified subdivision of route web. These types of informations provide information about velocity, hold informations. Travel clip and hold features are good indexs of the degree of service that is provided and can be used to mensurate the efficiency of the traffic flow. The velocity and hold surveies yields the informations about mean journey clip, mean journey velocity, norm stopped hold, mean running clip, entire stopped hold and mean running velocity along the stretch studied.
Need of Speed and hold surveies:
- Speed and hold surveies can supply information on the sum, location, nature of hold and cause for the hold. Congestion can be evaluated and can be rectified by traffic and other ordinances.
- Congestion index, Travel clip index are all dependant on the travel clip, which is obtained by the velocity and hold surveies.
Behavior of the study:
Out of the assorted available methods for transporting out velocity and hold surveies, drifting auto method / Test-Car technique method is used for the current undertaking. Two trial tallies are conducted to find velocity and hold for both peak and off-peak hr of the twenty-four hours.
Analysis of the informations:
The volume count informations collected from the field is scrutinized and the information is analyzed. The mean journey clip( in proceedingss ) for all the vehicles in the watercourse along the way of flow Q is given by equation 4.1 and 4.2 [ 5 ]
= Ttungsten– ( nY/q ) …………………………………4.1
Q = ( na+nY) / ( Ta+ Ttungsten) …………………….…..…4.2
Where,
Q = flow of vehicles along one way of the watercourse.
Na= mean figure of vehicles counted in the way of the watercourse when the trial vehicle travels in the opposite way.
NY= mean figure of vehicles catching the trial vehicle minus the figure of vehicles overtaken when the trial vehicle is in the way of Q.
Ta= mean journey clip, in minute when the trial vehicle is running against the watercourse Q.
Ttungsten= mean journey clip, in minute when the trial vehicle is running with the watercourse Q.
( Mention: Highway Engineering, S.K.Khanna and C.E.G.Justo ) [ 5 ]
End product of the survey
Delaies along the stretch are obtained and the type and ground for the holds are besides obtained.
4.1.3. Road Inventory Survey
Road stock list study is conducted to update the database of the bing route web.
Behavior of the study:
For the selected stretch, ocular stock list was conducted and the undermentioned stock lists of the installation have been done.
- Identified subdivision length.
- Effective route breadth.
- Presence of median.
- Quality of siting surface
- Presence of intersection installations.
- Handiness of foot way installations.
- Parking installations.
- Identified subdivision length
Two test tallies were conducted from Sunkadakatte to K.R.Puram and back, to find the effectual subdivision length between the beginning and finish and it is has been found out to be 26kms.
- Effective route breadth.
Road breadth available for the vehicular motion is calculated for every 250m utilizing tape and is represented as below in the graph. It is classified as route width holding breadth & A ; gt ; 7.5m, breadth & A ; lt ; 7.5m, Width & A ; gt ; 10.5m. Graph indicates that 41 % of the route in the identified stretch has effectual route breadth & A ; gt ; 7.5m, 25 % has less than 7.5m, and 34 % has greater than 10.5m.
Figure 4.1: Road width Classification
- Presence of median.
Majority of the route which comes under identified subdivision has median, approximately 86 % of the stretch has average and it is absent or removed for approximately 14 % of the subdivision, due to the building of subway and other infrastructural activity.
Figure 4.2: Median Handiness
- Quality of siting surface
Quality of siting surface is evaluated by Pavement rating [ 8 ] by ocular observations. Following process is followed to measure the quality of siting surface.
5
Pavement like new
4
Many old ages of service life
3
Near to or necessitating Rehabilitation
2
Should hold been rehabilitated in the last twosome of old ages
1
Should hold been rehabilitated many old ages
0 ago
Figure 4.3: Quality of siting surface
Based on the above process siting quality is evaluated and is found out to be 3.71 for the full stretch.
- Presence of intersection installations.
For the stretch of 26kms there are about 39 signalized intersections.
- Handiness of foot way installations
Road stock list surveies are conducted to mensurate the handiness of footpath length and this has installation has been described briefly under Walkability index in chapter 4
- Parking installations
Parking length on the on-street has been carried out to find the On-street parking index. This installation has been described briefly under On-street parking index in chapter 4.
4.2. Secondary Data Collection
The secondary informations required for the survey is collected from the assorted beginnings and informations collected from assorted authorities sections are as follows:
- Bangalore City Traffic Police.
Accident statistics informations is obtained from Bangalore City Traffic Police.
- Regional Transport Office, Bangalore. ( RTO )
Datas about Vehicles enrollment and the growing of vehicles for the decennaries is obtained from RTO, Bangalore.
- Bangalore Metropolitan Transport Corporation ( BMTC )
Datas abut coach fleet size, figure of agendas, figure of riders carried per twenty-four hours is obtained from BMTC, Bangalore.
