How it works

The Real-Time Traffic Adaptive Control System (RT-TRACS) is made up of several

modules. A data-processing and monitoring module selects the best strategy

to control the network of intersections, another module divides the network

into sections, and a simulation and evaluation module tests the strategy

and provides feedback to engineers.

The system organizes data as a set of past experiences that can be used

to predict and control signaling patterns. A case library, which can be

developed from field data or by using a simulation technique, can provide

predicted traffic conditions and the best control policy for certain traffic

conditions, such as inclement weather or special events. Factors such as

the location of the intersection, the time of day or the day of the week

can be factored into the predictions.

RT-TRACS measures traffic conditions by real-time volume and compares

them to those in the case library. The case that best matches the current

conditions is retrieved from the library, and the system automatically puts

a control strategy into motion.

The system can also display real-time graphics of system operation,

traffic flow and maintenance information so that traffic engineers monitoring

the system can view different data simultaneously.