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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
    • Vehicle Detectors
    • 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.


ATCS Server

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’.


The WML's Urban Traffic Control System (UTCS) is a microprocessor based Road Traffic Control System with Fixed Time and Demand Actuated Control.

The UTCS can be used as an independent system at isolated intersections or as part of a synchronized chain of controllers for coordinated control of traffic. The UTCS supports both cabled and cableless (CLF) synchronization. It uses highly accurate crystal oscillator for the drift free operation of its Real Time Clock (RTC) for time synchronization. Alternatively, the time synchronization can be achieved through GPS or broadcast from a central computer over PSTN line.

The UTCS supports group level programming and has facilities to monitor Green-Green conflict and Lamp burnout at software and hardware level. The controller has a LCD display with LED back lighting which gives very good visibility at outdoors.

The junction specific plans can be entered either through a built-in PC/AT keyboard or through a notebook PC. Unlike the currently available systems in the country, the UTCS supports a facility to enter the plans elsewhere in a PC and download to the controller at the site through the serial interface.

Remote monitoring and control of the UTCS controller is possible through dialup telephone network from a central computer. This facility supports plan entry from the remote computer.


  • Urban Traffic Control Mode
  • Fixed Time Mode
  • Manual Control Mode
  • Cable less Linking Mode
  • Cabled Synchronization Mode
  • Hurry Call Mode
  • Vehicle Actuated Mode
  • Semi Actuated Mode
  • Pedestrian Actuated Mode
  • Flash Mode· Part-time Mode
  • Fallback Mode· Distributed Time Synchronization
  • Day Light Saving Mode


  • Microprocessor based Fully
  • Solid State system
  • 32 Stages
  • 32 Phases
  • 26 Cycle Plans
  • 20 Day Plans
  • 4 Week Plans
  • 20 Holiday Plans
  • 4 Season Plans
  • Parallel Stage Streaming
  • Programmable Intergreen
  • Programmable Starting Amber
  • Programmable Minimum Green
  • Programmable All Red stage
  • Programmable Night Flash
  • Conflict Monitoring
  • 64 Lamp Controls
  • 4 Hurry Calls
  • 32 Vehicle Detection Inputs
  • Manual Override· Forced Flash
  • PC Interface· Microcontroller Watchdog
  • Online Signal Simulation
  • Highly accurate Master Time Clock
  • Remote Monitoring and Control
  • GPS for Distributed Time Synchronization
  • 40 Characters X 4 Lines LED backlit LCD Standard PC / AT Keyboard
  • Programs and Plans on Non-Volatile Memory· Day Light saving


  • One RS232 Port for PC interface
  • One RS232 Port for GPS
  • One RS232 Port for MODEM
  • Two RS485 Ports for Controller-to-Controller communication
  • 32 Optically isolated Vehicle Detector inputs
  • 8 Miscellaneous I/O Ports


Electrical: 230V AC, 50 Hz

Output Rating : 230V AC, 5A per channel Operating

Temperature: 0 to +550CRelative

Humidity: 95% non condensing

Cabinet: MS with double wall housing for control electronics

Mounting: Pedestal

Size: 960mm X 565mm X 330mm

Picture of Traffic Signal
Control Box of UTCS
UTCS software interface

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