A comparative study on road traffic management systems

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Special Issue: 15 | Dec-2014 | IWCPS-2014, Available @ http://www.ijret.org 108
A COMPARATIVE STUDY ON ROAD TRAFFIC MANAGEMENT
SYSTEMS
P.M. Xavier1
, Raju Nedunchezhian2
1
Dean (Academic & Student Affairs), Toc H Institute Of Science & Technology, Kerala, India
2
Principal, Sri Ranganathar Institute of Engineering and Technology, TamilNadu, India
Abstract
With the rapid stress in infrastructure development by all nations across the world, better designed, engineered and constructed
roads and highways have come up or are in different stages of implementation in rural and urban areas. With the improvement in
automobile technology, lighter and high-speed vehicles are a common sight along the highways. The highway environment
consists of fast and slow moving vehicles, traffic congestions particularly at traffic nodal points, collisions, accidents, bottlenecks,
and all leading to unpredictability in traffic flow causing considerable loss of time, upsetting schedules, economic loss and
environmental pollution. With the enhanced economic development, more and more automobiles will be on the road without
commensurate improvement in road space. Having dynamic information on traffic density along highways and lateral roads will
help in streamlining traffic flow. The state of road density is an important factor in evaluating travel times and travelling routes. A
number of studies have been carried out on traffic management by mathematicians, engineers and town planners with varied
outcomes. The studies are generally based on the volume, speed and density of vehicles on a given segment of road space using
conventional traffic detection devices such as Inductive loops, magnetic loops, cameras, radars and modern Intelligent
Transportation Systems (ITS) applications such as RF-Id, Wireless Sensors, VANETs and so on, each with its own limitations due
to variations in prediction accuracy, environmental factors, data collection difficulties and cost. With the ubiquitous presence of
mobile signals, it is now possible to monitor vehicular traffic flow along highways and lateral roads with a high degree of
accuracy with minimum cost. This paper is a comparative study of existing systems for vehicular traffic management and to
suggest the use of mobile signals for vehicular traffic management.
Keywords: Traffic flow, Intelligent Transportation Systems (ITS), Vehicular traffic management
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1. INTRODUCTION
Vehicular traffic management is a major area of concern for
town planners. The efforts by traffic managers and town
planners to overcome traffic congestion are not achieving
result as more and more vehicles are added to the road
network day by day which exceeds the intended physical
capacity of the road space. To tide over the traffic
congestion and to ensure better traffic management, timely
availability of dynamic traffic information with traffic
managers are essential to regulate the traffic and divert the
traffic to alternate routes.
There are several sources providing traffic information to
commuters through FM stations, GPS assisted systems.
However these are not covering the entire segment of
population as these systems have not become mass based.
Several other devices and systems such as traffic sensors,
inductive loop, magnetometer, infrared devices, acoustic,
ultrasonic, visual camera, radar and laser systems. As these
sensors are highly sensitive to environment such as weather
changes like rain, fog etc, they are less effective and error
prone, costly and needs regular maintenance. None of the
methods mentioned above has proved its effectiveness on a
long term basis.
This paper is a comparative study and performance
evaluation of various location finding techniques for mobile
tracking and its application for studying traffic densities in
highways and lateral roads.
2. EXISTING METHODS
2.1 Global Positioning Service (GPS)
GPS is a space-based satellite navigation system that
provides location and time information in all weather
conditions [1]. Any mobile station can freely use this service
with a GPS receiver which calculates its position by
precisely timing the signals sent by GPS. The position can
be calculated if the position of each satellite and the distance
from the satellite (pseudo range) is known. For accurate
results four or more satellites must be visible among the 24
satellites in 4 orbital planes as shown in figure 1.
Fig- 1: Traffic detection system using GPS

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Mobile phones with GPS receiver are now entering market.
However, its utilization is restricted due to high battery
power consumption and need for having line of sight
connectivity. Hence, its use is practically ruled out in indoor
coverage and where shadow coverage is available. In
addition, there is a time delay of 60-90 s in calculating the
location process.
2.2 Laser Tracker Technology
Laser Technology can be used to track an object by
measuring its distance [2]. The reflected laser beam is
analyzed and the distance from the target is measured using
either a laser interferometer or absolute distance meter
(ADM).The details from the laser beam is used to find the
traffic in an area using Grid based method.
This method is accurate in stable working environments. But
the accuracy is reduced by atmospheric effects. Another
drawback is it cannot track multiple objects in real-time as
laser travels in a straight and narrow path. Also, this
technique is very expensive and hence not used commonly.
2.3 Video Based Tracking
Use of Traffic cameras is a cost effective solution and is
flexible for monitoring traffic [3]. They can be networked
and remotely controlled and can cover areas of interest with
its pan and zoom facility enabling coverage in a larger area.
Hence, they are used for vehicle tracking particularly for
vehicle counts and speed measurements. The disadvantage
of this method is that to cover a longer road segment, large
no. of cameras are required and hence suitable for junction
monitoring.
2.4 Infrared
Infrared devices are useful where the visibility is poor and
having limited lighting conditions [4].
Fig-2: Vehicle detection using Infrared device
Working of infrared devices for traffic detection is shown in
figure 2. Based on the distance, the image quality undergoes
changes and the vision getting blurred. It does pick up
considerable amount of background noise. However, it is
being generally used as it requires low power, and hence
cost effective.
2.5 RF-ID
Radio Frequency Identification (RFID) is another method
for vehicular tracking and traffic management [5].
Fig-3: RFID for vehicle detection
Using this method we can uniquely identify what type of
vehicle it is and we can predict the traffic accurately by
analyzing the number of vehicles and their type as shown in
figure 3.
The major components of the system are:
a. the tags for identification of each vehicle
b. Interconnection with the tags
c. Processing of the information generated by the tags
2.6 Time of Arrival (TOA)
In this method [6] signal transmitted from the MS to the
BTS is measured at the BTS. Alternatively, the signal can be
initiated by the BS and the round-trip time is measured at
the BTS. The distance of the MS from a BTS is related to
half the round-trip time and the location of the MS is found
by the intersection of three circles of appropriate radius
(trilateration).
The distance is calculated by the following equation,
Where,
C-Propagation speed of electromagnetic wave,
-Propagation time from the mobile telephone to ith
base
station,
ith
base station,
X Y-Mobile position
TOA clock inaccuracies of just 1µs will introduce a position
error of 300 m as the velocity of the signal is 3×108
m/s.
Hence, it requires very accurate knowledge of the start time
of transmission and all receiving devices need to be
synchronized.
2.7 Angle of Arrival (AOA)
In this method [7], Angle of Arrival (AOA) of a signal is
measured. Signal from either a BTS or MS can be used for
measuring the angle. The mobile is programmed to receive
signals from a number of BTSs and is shown in figure 4. In
AOA method, minimum two BTSs are required for the
determination of the angle. By knowing the direction of the
signal with respect to the location of the BTS, it can
measure the angle of incidence with respect to normal and
find out the position of the MS. However, the accuracy is

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limited. AOA method is not that accurate for finding mobile
location because of the following disadvantages:-
 Being wireless environment, obstacles, atmospheric
particles, scattering etc. can cause change in angle of
incidence thus leading to errors.
 AOA cannot be accurately determined if the base
stations are in straight line.
 Usage of this method in indoor applications may
lead to considerable inaccuracy.
AOA method requires minimum two base stations to get a
location estimate. But it shows very poor performance in
rural areas because of the linear orientation of base stations
along major roads. Expensive antenna arrays are needed to
overcome this. A small angular error of the antenna array
can produce a significant error in location estimate. Also
increase in the distance between the mobile stations reduces
the accuracy.
Fig- 4: Estimation of the arrival angle of the signal from a
MS at a BTS
AOA method is not the first method of choices in highly
dense areas where LOS is generally not available. However
this technique will be used in rural areas with a reasonable
amount of accuracy. The accuracy of this method is about
50 m in suburban environment.
2.8 Time Difference of Arrival (TDOA)
The BTS stations A, B and C are synchronized in order to
ascertain the time difference of arrival (TDOA) of the GSM
signal [8]. The time difference of arrival of the signal
between station A and B is denoted TDOA and describes
a hyperbola curve as shown in figure 5. When evaluating a
second time difference of arrival, e.g. between station A and
C denoted TDOA , a second hyperbola curve leads to an
intersection point which serves as the fix for the mobile
phone location. For a two-dimensional localization, at least
three receiving stations are necessary.
Fig-5: Time Difference of arrival
The system provides about 5-10m accuracy under favorable
environmental conditions and accurate system
synchronization. It is useful for locating and in search and
rescue operations.
2.9 Observed Time Difference of Arrival (OTD)
This mechanism has each MS monitor the time differences
between the epochs of the different BSs in its vicinity [9].
These observed time differences are obtainable in both the
idle and communication modes of a MS and are used to
estimate the change in timing advance or retard required at
handover to another BS. Positional location can be derived
by comparing OTDs from a number of BSs.
But it is difficult to implement in rural and hill stations as
BSS is very small.
2.10 Enhanced Observed Time Difference of
Arrival (E-OTD)
The E-OTD operates only on GSM network [10]. A location
estimate can be produced in both idle and call modes. The
E-OTD method is based on measurements in the MS of the
relative time of arrival bursts received from serving BTS
and at least one pairs of BTSs.
Figure 6 explains the functioning of the E-OTD method.
The measurement units are dispersed in a larger area. The
base station broadcasts a signal every 30 second in an
asynchronous manner. Based on the signal from a minimum
of three base stations by the handset and LMU, the time
difference in arrival of the signal from each BS at the
handset and LMU are calculated. The differences in times
are combined and the location of the mobile station is found
out by intersection. It is one of the accurate methods which
have an accuracy of 60 to 125 meters.
Fig-6: E-OTD

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The disadvantages of this method include modification of
handset with E-OTD software, installation of LMU for
infrastructure and multipath problems.
3. CONCLUSION
Location based services (LBS) as seen from the above
discussions is useful in tracking and locating. However, the
mobile number of the individual is to be known. The
accuracy of the systems depends on timing synchronization,
availability of line-of-sight, conducive environmental
conditions, orientation of the BTS sites and so on. LBS in
general is not a solution for use as a traffic management
tool. Systems such as Video based tracking, Infrared and
RF-Id, are useful in monitoring and counting of traffic flow.
However, these devices also have limitations due to
environmental, weather, ambient temperature differences,
cost and frequent maintenance requirements. Out of all
devices discussed, GPS is a better method with better
accuracy but is costly and is not likely to be universally
equipped in the near future. Therefore the existing location
based systems are not sufficient for mobile tracking and we
need to find alternatives.
Since nineties, considerable amount of research is being
done in utilizing mobile signals for vehicular traffic
management. The advantage of using mobile network for
traffic management is that it is cost effective as the
infrastructure already exists and the mobile signals are
ubiquitous. The location of the MS if tracked continuously
can predict the movement of vehicles as it is presumed that
each and every vehicle will have a minimum of one mobile
phone.
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BIOGRAPHIES
Prof. (Col.) P. M. Xavier holds B. Tech
degree in Telecommunication from JNU,
Delhi, in 1979 and M. Tech Degree in
Electronics from Central University
Allahabad, Uttar Pradesh, in 1990. Major
fields of interests includes microwave
communication, mobile cellular systems and
optoelectronics. He joined the Indian Army in the year 1967
and retired as Colonel from Corps of Signals. On retirement,
he served with Birla AT&T as GM Engineering/Project till

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2001. Thereafter, he worked with Alcatel-Lucent till 2007 as
Regional Manager. He has been with Toc H institute of
Science & Technology as Professor since 2007, teaching
and guiding both B. Tech & M. Tech students and presently
he is Dean (Academics & Student Affairs) of the institute.
Prof. (Dr.) Raju Nedunchezhian is the
Principal of Sri Ranganathar Institute of
Engineering & Technology, Coimbatore,
Tamilnadu. Prior to this, he was Vice-
Principal of Kalaignar Karunanidhi Institute
of Technology, Coimbatore, TamilNadu. He
also worked as Research Coordinator of the Institute and
Head of Computer Science and Engineering Department
(PG) at Sri Ramakrishna Engineering College, Coimbatore.
He has more than 22 years of experience in research and
teaching. He obtained his BE (Computer Science and
Engineering) degree in 1991, ME (Computer Science and
Engineering) degree in 1997 and Ph.D (Computer Science
and Engineering) in 2007. He has guided many UG, PG,
M.Phil and Ph. D scholars. Currently, he is research guide
for many Ph. D scholars of the Anna University,
Coimbatore, and Bharathiar University.

A comparative study on road traffic management systems

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A comparative study on road traffic management systems