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ISSD – Smart Traffic Solutions

Dynamic Junction Management System (CHAOS™)


Dynamic Junction Control System


CHAOSTM reduces delays and emissions at the signalized junctions by changing green light time internals dynamically depending on the number of vehicles on each approach. CHAOSTM systems can communicate with each other via wireless connection modules for signal coordination and network optimization.

CHAOSTM consists of traffic cameras, which detect, count and track vehicles in real time, a fisheye camera for observation purposes and the Dynamic Junction Control Unit, CENTRIS. Traffic cameras are located at each approach, and each of them consist of a digital camera, an image processing board and a wireless communication module, which is for transmitting data to CENTRIS and the Traffic Control Center.

The results of more than 700 CHAOSTM installations worldwide show that, the junctions with CHAOSTM experienced a decrease of 30% of waiting time and more than a third in  traffic accidents.


  • Less congestion at junctions and the road segments between the junctions
  • Minimized waiting times at junctions and total time spent in traffic
  • Less environmental pollution by reducing emissions and noise pollution
  • Contribute to the country’s economy with less fuel consumption
  • Due to green light time intervals produced by the system, decrease on red light violations and traffic accidents
CHAOSTM, the first and patented Dynamic Junction Control System in Turkey
Chaos Technic Eng



Traffic Control Center Software



Traffic Control Center 2

traffic light 1179796



Dynamic Junction Control Unit

CENTRIS is a multi-functional control unit, which is used for junction management, signal optimization and the remote control of any traffic sensor/device including the detection of failures. Its high-speed processor allows analyzing collected data from various sensors in real time, and running the customized algorithms inside.




Vehicle Counting System

VIERO™ is capable of counting vehicles passing through a road section under all weather conditions. VIERO™ can provide occupancy, average vehicle speed, vehicle counts and classification data in real time. The collected data can be transferred to a remote control center via wireless/wired connection.


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Signal Coordination with CHAOSTM

CHAOSTM systems can communicate with each other via wireless connection. This property can be used for signal coordination between consecutive junctions. The main purpose of signal coordination is to reduce travel times along a corridor by coordinating the junctions. This application is generally known as “green wave” and used to reduce corridor travel time, delays and traffic congestion at the junctions on a corridor. It is also possible to manage the junctions in both coordinated and actuated mode, which makes vehicles either not waiting in the red light or waiting for a very short time.

Emergency Vehicle Preemption System

With CHAOSTM, it is possible to give priority to emergency vehicles coming from any approach of the junction. Emergency vehicles which are defined in Traffic Control Center software are detected and tracked by using GPS data. CHAOSTM calculates the best scenario to minimize emergency vehicle delays. Vehicle preemption algorithm runs to minimize the conflicts and prevent possible accidents at the junctions.