Operating InSync

Adjusting Parameters

Once InSync is adapting traffic signals to actual demand, the operator can be as active or passive as desired in the operation of InSync. Some traffic practitioners enjoy providing new inputs and preferences on a daily basis. Others go months without actively operating or adjusting InSync.

There is little ongoing configuration or alteration work unless there is a significant and permanent change in traffic patterns or volume. Rhythm Engineering has seen evidence of corridors and motorist behaviors evolving with the introduction of better progression – prevailing speeds and volume tend to increase as motorists become aware of and accustomed to the improved progression and level of service. This may cause the need for a small investment of time to modify the configuration.

Changing Local Optimizer Settings

Using CentralSync, the traffic practitioner can adjust InSync’s parameters in order to make the system perform differently. Changes are made to the settings via an easy-to-use graphic interface that makes selecting or deselecting options as simple as the click of a mouse.

The traffic practitioner can adjust the local optimizer’s settings by choosing the permitted phasing and sequencing such as leading or lagging left-turns. He/she can also tell InSync the minimum light times programmed into the controllers, input pedestrian phase information including the ‘walk’ and ‘don’t walk’ times and associate the pedestrian phases with a permissible vehicle phase.

How InSync Integrates with Pedestrian Traffic

Changing Global Optimizer Settings

The traffic practitioner can adjust the global optimizer’s settings, modifications that affect the protocol for progression. The amount of green time dedicated to the coordinated movement at each individual intersection can be adjusted, allowing more green time for the side streets. The thresholds for tunnel duration can also be edited, which allows a coordinated movement tunnel to end sooner if there is low demand. Finally, parameters for dynamic periods can be adjusted. This changes the amount of time between coordinated movements (green tunnels).

TimeSpace Diagram

The tunnel view within CentralSync allows the operator to edit tunnel durations, offsets and the period length.

In addition to these basic configuration settings, the traffic practitioner can create unique configurations for special events and schedule when they will be implemented.

Modifications to InSync configurations within CentralSync can be uploaded and downloaded remotely by the operator.



“InSync provides seamless operations between intersections with minimum delays and drive times. No engineering staff time is necessary to address changing traffic patterns in this growing section of Little Rock. We are extremely pleased with the system.”