TRAFFIC INFORMATION SYSTEM

Presented by :Anil Kr. Chhotu (11ID60R06)Pranav Mishra ( 11ID60R20)

INTRODUCTION

Traffic information system may be defined as an information system which involves the collection and processing of current traffic data by traffic control agencies for dissemination of such information to the users.

WHY T.I.S. ????

Traffic congestion has always been a seriousproblem for commuters in the metropolitan areasaround the world. It causes unpleasant andunpredictable delay. With a good T I S in place the users can react to congestion by taking an alternative less congested route based on the traffic information they receive.

T.I.S. helps toMonitor and manage traffic flow.Reduce congestion.Provide safety.Enhance mobility.Reduce energy consumption.Reduce pollution.Develop a multi-modal public

transport enquiry system to encourage the public to use public transport services

ELEMENTS OF T.I.S. T I S consist of 3 key elements, namely Traffic information data collection Data Processing Information Dissemination

Data

Processing

Data collection

Information Disseminati

on

Information To Be Shared Transit RoutesTransit SchedulesTurning

restrictionsSpeed RestrictionsDirection ControlsLane ClosuresRoad DiversionsDelay timeTravel time

New RoadsAccidentsIncidentsTraffic ConditionsOperational

StatisticsTrendsUsage Congestion

Broad classification.Centralized systemDecentralized system.

Centralized system

It involve a central authority to collect, process and disseminate the data.

Data of vehicle speed and traffic flow are calculated by◦Embedded censors.

This data is sent to T.M.C. for processing and analyzing.

The result of this analysis is disseminated via◦Radio broadcasts.◦ Internet.◦Variable message signs.◦Direct to user on demand.

Disadvantage ◦ Cost intensive.◦ Limited coverage.

Limited coverage…?The problem of limited coverage

is solved to a limit by use of PROBE vehicles.

These are the vehicles which are fitted with devices to collect and transmit data to TMC at regular intervals.

Centralized traffic information system

OLSIM

OLSIM Along with real time situation, it also forecasts the

situation 30 min. and 60 min. hence. Real time data are collected from LOOP DETECTORS,

and processed to give real time information. For forecasting, actual traffic data from loop detectors

are combined with heuristic data from VMS, TWS. It has been proposed at North Rhine-Westphalia,

Germany. Data collected from loop detectors are

◦ Number of vehicles◦ Average speed of vehicles.◦ Average occupancy.

All the processed information is integrated in a Java applet and can be accessed by any user on web.

Setup of OLSIM T.I.S.

The information can be accessed from website www.autobahn.nrw.de

Decentralized systemIt is a zero public infrastructure vehicle

based traffic information system.A traffic situation analysis is performed in

each individual vehicle and the result is transferred via wireless data-link to all surrounding vehicles in the local neighborhood.

Why decentralized T.I.S…??The problems with Centralized T.I.S. A large number of sensors is needed to be deployed in order to monitor the traffic situation. The traffic information service is limited to streets where sensors are integrated.Traffic information is distributed with a relatively high delay (typically in the range of 20-50 minutes). It is not suited for vehicle-to-vehicle emergency notifications.Cannot include specific details on the area close to the current position of the driver.An extremely large investment for the communication infrastructure (sensors, central unit, wired and wireless connections) is necessary.

SOTISSelf-organizing Traffic Information System

(SOTIS): • Each vehicle monitors the locally observed traffic

situation by recurrently receiving data packets with detailed information from other vehicles.

• A traffic situation analysis is performed in each individual vehicle and the result is transferred via wireless data-link to all surrounding vehicles in the local neighborhood.

• No sensors along the highways, no central units and no broadcast stations or cellular networks are needed.

• The complete system can be easily deployed and service charges for the end user can be avoided completely.

SYSTEM DESIGNThe SOTIS system design is based on the

following guidelines and technical assumptions:The SOTIS technique should be able to provide

reliable travel and traffic information for the area that can be reached in the near future by the driver.

Each SOTIS vehicle is equipped with a satellite navigation receiver (GPS), a digital street map, a simple digital radio and a small data processing unit.

The SOTIS service should be available at each position, on highways and in cities, at any time.

For covering large area with limited bandwidth, simple control systems should be used to avoid data packet collisions.

Types of Report by SOTIS

Periodic report.

Emergency report

SOTIS traffic information distribution technique

Receive

Analyze Send

SOTIS Packet propagation

Comparative performance

Driving route based Visual TIS As jam level represents average speed of vehicles, TIS

usually reports same jam level to all users. Whereas different drivers have different perception of

same traffic situation.◦ At intersections.

◦ At some hot spot.

Hence, an improved TIS was proposed to provide specific data to specific users based on routes or destination.

Information is collected by on-vehicle camera and sensors.

Each user gets data according to his own route plan, collected by other vehicles of same destination.

This system is applied for routes with obvious deviations.

If the route of driver is known, potential deviations on the route can be identified and information for that user can be customized.

The system consist of two parts –◦Vehicles, with modules of

Communication. Location detection. Visual information. Input/display

◦Traffic centre, with modules of Communication Visual information collection to analyze. Visual information distribution according to route

plan.This system can provide personalized service.

References http://www.uctc.net/research/diss144.pdf

http://www.utwente.nl/ctw/aida/research/publications/TM_main_report_survey.pdf

http://www.billingpreis.mpg.de/hbp03/OLSIM.pdf

http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=05970119

http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=6060109

http://www.mendeley.com/research/decentralized-traffic- information-system-design-based-intervehicle-communication/