Traffic Simulation
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Transcript of Traffic Simulation
ANNA UNIVERSITY
DIVISION OF TRANSPORTATION ENGINEERINGDEPARTMENT OF CIVIL ENGINEERING
CHENNAI 600 025
Project Title : TRAFFIC SIGNAL OPTIMIZATION FOR IT CORRIDORProject Guide : Ms. G. MALARVIZHI
Viva-wise
PRESENTATION BY
BALAKRISHNAN.L.G
KARTHIKEYAN.MSANKAR.K
SOORIYAKUMAR.S
NEED FOR THE STUDY
Rajiv Gandhi Salai (Old Mahabalipuram road) also known as IT
Corridor is one of the most important roads in ChennaiThis road has considered for study since heavy traffic congestion
on both the directions of the roadReason for traffic congestion in this road areuncontrolled traffic flow due to IT and other major industries are
located along the corridorImproper signal timingsignals are operated manually some of the signals are not functioningNo coordination between the signals
Fig shows Traffic Congestion in the Project Corridor
Traffic congestion causesIncrease in the total travel time It causes environmental degradation through air and sound pollution.reduction in the speed, Increases the accident potential, and Cost ineffectiveness of the transportation systemTo overcome the above problemTraffic signal optimization is typically needed to process traffic efficiently through a group of intersections. It attempts to reduce the number of stops and regulate the traffic,It reduces accident potentialNeed for signal optimization may be justified by high levels of vehicle emissions and poor air quality.
OBJECTIVE OF THE STUDY
To study the present traffic flow characteristics and
physical features of the study network.
To determine the optimal signal timings by considering
prevailing traffic flow for the corridor
To improve the traffic flow using a traffic signal
optimization tool TRANSYT.
LITERATURE REVIEW
Yun and Brain Park published a report in Stochastic Optimization
Method for Coordinated Actuated Signal Systems on Dec 2005Traffic Engineering Division Colorado Springs published a report in
Traffic Signal Coordination Planning Effort on April 2005R.Kaviarasu presented the paper in feasibility of introducing traffic
signal coordination on Indian Roads
OBSERVATION FROM REVIEW OF LITERATURE
These studies show that, Indian roads comprise of mixed traffic
which influences the effectiveness of signal coordination in urban
areas.From the past studies it is observed that the improper signal timing
was the reason for traffic issuesOptimization & Coordination of traffic signals resulted in improved
travel time, reduced accidents, improved mobility and access.
LITERATURE REVIEW
Stochastic optimization method may be sensitive to the parameter
settings for optimization and the number of signal timings to be
optimized.
A significant demerit of the stochastic optimization method is huge
computational requirement.
TRANSYT could be used for evaluation of optimized traffic signal
timings.
METHODOLOGY CHART
METHODOLOGY
1. Collection of primary and secondary data for existing conditions of the study area. The data to be collected arePhysical feature of the study networkTraffic volume count study at each intersection.Pedestrian volume count.Existing Traffic Signal Phasing pattern and timings at each intersection.2. Optimize the signal timings for the existing flow conditions using Traffic Signal Optimization tool TRANSYT.3. To suggest and recommend new traffic management measures for traffic flow.
STUDY AREA
•Rajiv Gandhi Salai (Old Mahabalipuram road) also known as IT Corridor connecting Adyar at the Northern end and Mahabalipuram at the Southern end. •It is a six lane divided road carriageway and also consists of service lanes at either side from Madhya Kailash upto Taramani•The study network is selected from Tidel Park intersection to Taramani road intersection.•It consists of four junctions namely Tidel park intersection, Ascendas intersection, LB Road intersections and Taramani road intersection. •The reason for choosing this stretch is that it has been signalized and the intersections are located within 800 meters which is the prerequisite for effective traffic signal optimization
Fig shows the study area
DATA COLLECTIONVolume Count Survey
Tidal Park Intersection
Peak hour traffic flow observed at this intersection -
10117 PCUs
Maximum Flow direction along Madhya Kailash to Perungudi - 2585
PCUs
Direction Wise Flow of Traffic during Peak Hour
Photo shows conducting traffic survey
DATA COLLECTIONVolume Count Survey
Tidal Park Intersection
Maximum % composition of Vehicles areTwo Wheelers - 50%Cars - 33%
Maximum flow observed from the hourly variation curve during 8.45 to 9.45 am
Hourly Variation of Traffic flow
% composition of vehicles
DATA COLLECTIONVolume Count Survey
Ascendas Intersection
Peak hour traffic flow observed at this intersection - 7656
PCUs
Maximum Flow direction along Madhya Kailash to Perungudi - 2232
PCUs
Direction Wise Flow of Traffic during Peak Hour
DATA COLLECTIONVolume Count Survey
Ascendas Intersection
Maximum % composition of Vehicles areTwo Wheelers - 48%Cars - 34%
Maximum flow observed from the hourly variation curve during 8.45 to 9.45 am
Hourly Variation of Traffic flow
% composition of vehicles
DATA COLLECTIONVolume Count Survey
LB Road Intersection
Peak hour traffic flow observed at this intersection - 7368
PCUs
Maximum Flow direction along Thiruvanmiyur to Perungudi - 2566
PCUs
Direction Wise Flow of Traffic during Peak Hour
Thiruvanmiyur
DATA COLLECTIONVolume Count Survey
LB Road Intersection
Maximum % composition of Vehicles areTwo Wheelers - 45%Cars - 35%
Maximum flow observed from the hourly variation curve during 8.45 to 9.45 am
Hourly Variation of Traffic flow
% composition of vehicles
DATA COLLECTIONVolume Count Survey
Tharamani Intersection
Peak hour traffic flow observed at this intersection - 7433
PCUs
Maximum Flow direction along Madhya Kailash to Perungudi - 3232
PCUs
Direction Wise Flow of Traffic during Peak Hour
DATA COLLECTIONVolume Count Survey
Tharamani Intersection
Maximum % composition of Vehicles areTwo Wheelers - 46%Cars - 35%
Maximum flow observed from the hourly variation curve during 8.45 to 9.45 am
Hourly Variation of Traffic flow
% composition of vehicles
Peak Hour Flow, Timings and Distance between the Intersections
Intersection Peak Hour Peak Hour PCUs
Distance in m
Tidal Park 08:45-09:45 am
10117 0
Ascendas 08:45-09:45 am
7656 300
LB Road 08:45-09:45 am
7368 800
Tharamani 08:45-09:45 am
7433 1000
Tharamani Intersection
DATA COLLECTION
Physical Inventory
Topo surveys have been conducted for identifying the existing
landuse and other design parameters at the junctions
DATA COLLECTION
Existing Signal Timings
Junction Name: Tidal Park Direction Timings in sec
From To
Madhya KailsahPerungudi 64Tidal ParkThiruvanmiyur Free left
PerungudiMadhya Kailsah 44ThiruvanmiyurTidal Park Free left
ThiruvanmiyurMadhya Kailsah 34Tidal ParkPerungudi Free left
Tidal ParkThiruvanmiyur 18PerungudiMadhya Kailsah Free left
Junction Name: Asscendas Direction Timings in sec
From To
Madhya Kailsah Perungudi 42Tharamani
Perungudi Madhya Kailsah 42Tharamani Free left
Tharamani Madhya Kailsah Free leftPerungudi 20
Junction Name: Thiruvanmiyur
Direction Timings in secFrom To
Madhya Kailsah Thiruvanmiyur Free left
Perungudi Free straight
Thiruvanmiyur Perungudi Free left
Junction Name: Tharamani
Direction Timings in secFrom To
Madhya Kailsah Perungudi 38
Tharamani 34
Perungudi Madhya Kailsah 38
Tharamani Free left
Tharamani Madhya Kailsah Free left
Perungudi 34
OPTIMIZATION OF SIGNALS
Optimization is done using Traffic optimization tool TRANSYT
In TRANSYT common data such as network cycle time, simulation time etc are to
be given as input
OPTIMIZATION OF SIGNALS
Optimization starts with the Assigning of Node numbers for all the
intersections
OPTIMIZATION OF SIGNALS
Link numbers are assigned based on the movement of traffic along the
nodes
OPTIMIZATION OF SIGNALS
The program will run for offset optimization and green & offset
optimization and the corresponding signal timings obtained for both the
optimization techniques.
Network Representation of Netcon Editor in TRANSYT
FINDINGS AND RECOMMENDATION
Findings from Field Observation The total length of the study stretch is around 1000mThe distance between intersections varies between 200m and 500mThere are four no of signal are in study stretch. Tidal Park signal and Tharamani road
signals are operated manually and Ascendas signal was not working and LB road
intersection was not provided with the signal.Maximum signal timing of 64 sec operated in Tidal Park intersection from Madhya
Kailash arm towards Perungudi. Maximum traffic is handled by the Tidal Park Intersection with 10117 PCUs.The Highest turning traffic is at Tidal Park Intersection with 48% from Perungudi arm
towards Thiruvanmiyur.The two-wheeler traffic is around 45 to 50% of the total vehicles at all the
intersections.Car traffic is around 33% at all the intersections.Auto and bus traffic constitutes around 10% and 3% respectively at all the
intersections.Jay walking of Pedestrians in the Tidal Park intersection is around 600 nos though
the foot over bridge is available near the intersection.
FINDINGS AND RECOMMENDATION
Findings from Optimization by TRANSYT
Total Distance Travelled in Initial Settings is 7156.5 PCU-KM/H
Total Time Spent in Initial Settings is 4036.4 PCU-H/H
Time Reduced in Offset Optimization is 3656.0 PCU-H/H
Uniform Delay reduces from 436.1 PCU-H/H to 374.3 PCU-H/H
FINDINGS AND RECOMMENDATION
Recommendation
The capacity of signalized intersections can be optimized by periodically recalibrating
the signal cycle times to cope with the traffic volumes.
A traffic database may be maintained by capturing information on the traffic along the
corridor by installing automatic traffic recorders.
Tidal Park Intersection has the total traffic flow of 10117 PCU which is greater than
10000 PCU. As per IRC 92-1985 an interchange should be provided for more than
10000 PCU in a junction.
However providing interchange may not be possible since Bukigam Canal flows
along the corridor on left side, hence Tunnel way may be provided for through traffic
from Tidal Park Intersection to Tharamani Intersection.
This may adversely reduce the traffic congestion in the study area.
Demarcating of stretches of roads exclusively for movement by pedestrians and
cyclists and providing safe passage of pedestrian / cyclists by sub-ways.
FINDINGS AND RECOMMENDATION
Recommendation
Providing ducts for services and utilities will reduce traffic congestion during
maintenance
Organize campaigns and special drives to educate the road users to adhere to traffic
discipline
Enforcement of laws & regulations with respect to traffic movement and violation at
signals.
THANK YOU