Area Traffic Control System (ATCS)
Area Traffic Control System (ATCS) is an
indigenous solution for Indian Road Traffic, which optimizes traffic
signal, covering a set of roads for an area in a city. It is an
intelligent traffic signal control system that use data from vehicle
detectors and optimize traffic signal settings in an area to reduce
vehicle delays and stops.
The control system operates in real time
with a capacity to calculate optimal cycle time, and feeds input to
traffic signal controllers with a different set of stage timings. The
timing plans of traffic controller change automatically to reduce
stoppage time, which in turn reduces overall journey time.
The road traffic controllers can be
connected to ATCS server through managed leased line network. Thus
traffic monitoring over an area can be made possible from a central
location. The system facilitates storing of traffic data for individual
junctions over a period of days, including traffic pattern during peak
hours, which enables traffic engineers to view and analyzing the same.
The original technology on ATCS was
developed by Centre for Development of Advanced Computing (CDAC,
Thiruvananthapuram), WML is manufacturing the same and have supplied
more than 200 controllers in cities such as Pune, Jaipur, and Ahmedabad.
The system supplied so far is working satisfactorily at different
environmental condition and hence filed proven.
The Major building blocks of the Area
Traffic Control System are the following.
Traffic Signal Controller
Communication Network thru’ Leased Line
Central Control System
ATCS application software
Traffic Signal Controllers are the electronic equipment kept at the
junction to control duration of traffic signals. The controllers are
designed using microprocessor based control circuits, and can be
operated in any one of the following modes e.g. Fixed Time mode, Demand
Actuated Mode, Forced Flash Mode etc.
The function of the Vehicle Detector is to
identify the presence or passage of vehicles and provide input for
traffic actuated signal control systems. Different types of vehicle
detectors are currently available, but among them, the most popular and
economical one is the conventional inductive loop vehicle detectors.
The sensor loop is embedded on the pavement
consisting of one or more turns of wire. Metallic parts of the vehicle
resting or passing over the sensor loop will unbalance the tuned circuit
(detector local oscillator) resulting in detection. The size, shape, and
configuration of the loop vary considerably depending upon the specific
application. The loop sensors, vehicle detectors together with control
electronics sense the traffic load at the junction.
The communication network is the
intermediate part which helps to communicate between the central control
station and remote end junction controller. After analyzing the overall
traffic flow in a corridor or a in a city the central control station
updates the time plan to each and every junction controller through this
UDP Internet Protocol based network communication link.
The Central control system (CCS) consists of
ATCS Server, Operator Consoles, external storage device, projection
system etc. All traffic signal controllers are connected to the CCS over
managed leased line network at 64kbps. The status of individual junction
controller, their loaded timing plan, and stage utilization timings can
be viewed at a glance from this central location.
ATCS application software runs on WINDOWS
platform, and uses latest RDBMS for managing its database. The
application software maintain database for time plan execution and
system performance, maintain error logs and system logs, graphically
represent signal plan execution and traffic flow at the intersection,
and network status plan.
The complete system manages traffic flow of
a corridor in a more efficient way, minimizes the overall journey time &
fuel consumption. The same technique was implemented at 38 junctions of
Pune city, and Post installation Survey Reports reflects good response.
For details visit the link ‘Pune Survey on ATCS’.