How InSync Works

Albert Einstein once said, “Problems cannot be solved by the same level of thinking that created them.” In developing InSync–a solution for dozens of traffic challenges–we used new thinking from start to finish. InSync’s architecture, analytic capabilities and optimization algorithms are built on a total re-imagining of what’s possible.

New thinking also means InSync achieves new results. Today, more U.S. agencies trust InSync than any other adaptive solution.

How InSync Works

The InSync Model’s Three Components

There are three main components of InSync’s unique, real-time adaptive model:

Digitize Signal Operations

Convert traffic signal operations from analog to digital in order to break free from the constraints of linear thinking

Local Optimizer

To minimize delay at individual intersections

Global Optimizer

To coordinate progression along a series of intersections on a corridor or network, explore  these three concepts to learn how InSync makes decisions that measurably improve traffic.

Guaranteed Results – the InSync Promise

Money Back Guarantee

InSync’s results are so consistent and effective, we guarantee them. Give us three months to solve your traffic challenges, and if you are not satisfied, return your InSync hardware for a full refund.

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The Birth of InSync

When developing InSync in 2005, Rhythm Engineering used creative approaches and technologies new to the transportation engineering industry. Instead of developing incremental improvements to existing traffic control tools and methods, we imagined the best possible traffic control tool.

Our exploration led us to the human brain, or rather, the brain of a well-informed traffic engineer. Once we understood that no existing machine or method matches the analytical, reasoning and observational abilities of a traffic engineer, we set out to build one. We challenged ourselves by asking, “How would a traffic engineer control a signal if he/she were standing at each intersection?” We then built a solution that comes as close as possible to emulating that decision process and its benefits.

Emulating a well-informed traffic engineer at each intersection means InSync must detect demand in real-time, be able to make immediate adjustments in signalization, not be constrained by “mechanical” thinking and be aware of upstream and downstream traffic conditions. In other words, InSync at each signal must know the actual traffic conditions, have the power to make dynamic changes and appreciate what conditions will exist in the next few minutes.

This is a substantial departure from other traffic management systems. Nearly all traffic control systems today use digital hardware but remain constrained by analog thinking such as common cycle lengths, set sequences, fixed offsets and standardized allotment of green time, or splits. The InSync Processor is instead a modern state machine, meaning it can dynamically choose which phases to serve and instantly adjust and coordinate service and green time. By adapting to actual traffic demand, InSync is superior to predetermined signal timing plans that, at best, estimate traffic demand based on a small historical sampling and generalize those results across years of traffic signalization. InSync’s ability to constantly see and flexibly serve actual demand in the best way possible is what enables it to produce such astounding before-and-after results.

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InSync turns your coordinated movements green when you want them to be green. The rest of the time, the signals run intelligently fully-actuated.


Proven, Patented Technology


Rhythm Engineering currently holds 4 patents in use in InSync. These patents are testament to the unique intelligence and operations of InSync.