Traffic information systems collect and process current traffic data and disseminate it to users. They can be centralized, with a central authority collecting, processing, and sharing data, or decentralized, where each vehicle collects and shares local data. Key elements include data collection, processing, and dissemination. Decentralized systems avoid issues with centralized systems like limited coverage and high costs. One example is SOTIS, where each vehicle monitors local traffic and shares data with surrounding vehicles via wireless links. This allows comprehensive coverage without fixed infrastructure. Driving route-based visual TIS provides personalized traffic information to each user based on their specific route.

1. TRAFFIC INFORMATION
SYSTEM
Presented by :
Anil Kr. Chhotu
(11ID60R06)
Pranav Mishra (

2. 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.

3. WHY T.I.S. ????
Traffic congestion has always been a serious
problem for commuters in the metropolitan areas
around the world. It causes unpleasant and
unpredictable 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.

4. T.I.S. helps to
 Monitor 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

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

6. Information To Be Shared
 Transit Routes  New Roads
 Transit Schedules  Accidents
 Turning restrictions  Incidents
 Traffic Conditions
 Speed Restrictions
 Operational
 Direction Controls Statistics
 Lane Closures  Trends
 Road Diversions  Usage
 Delay time  Congestion
 Travel time

7. Broad classification.
 Centralized system
 Decentralized system.

8. Centralized system

9.  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.

10. 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.

11. Centralized traffic information
system
 OLSIM

12. 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.

13. Setup of OLSIM T.I.S.
 The information can be accessed from
website www.autobahn.nrw.de

14. Decentralized system
 It 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.

15. 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.

16. SOTIS
Self-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

17. SYSTEM DESIGN
The 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.

18. Types of Report by SOTIS
Periodic report.
Emergency report

19. SOTIS traffic information
distribution technique
Receive Analyze Send

20. SOTIS Packet propagation

21. Comparative performance

22. 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

23.  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.

27. References
 http://www.uctc.net/research/diss144.pdf
 http://www.utwente.nl/ctw/aida/research/publications/TM_mai
n_report_survey.pdf
 http://www.billingpreis.mpg.de/hbp03/OLSIM.pdf
 http://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=059701
19
 http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=60
60109
 http://www.mendeley.com/research/decentralized-traffic-
 information-system-design-based-intervehicle-
communication/