Traffic Signal Timing Plans vs. InSync® Adaptive Signals

Optimized Signal Timing Plans vs.
InSync Adaptive Traffic Signals
The Results of a New Microsimulation Study
by Aleksandar Stevanovic, Ph.D, PE
About the Microsimulation Study
Aleks Stevanovic, Ph.D, PE
Florida Atlantic University
Watch the recorded webinar and download the full study at
Improving Signal Performance
“It’s easy to improve on a suboptimal timing plan.”
But what about optimized TOD timing plans?
How much better are adaptive signals?
Several field studies of InSync vs. optimized TOD
Why Microsimulation?
Comprehensive evaluation of performance
Tightly controlled experiments
Abundance of data outputs
The Real Corridor Simulated
Volusia County, Florida
12 intersections
ADT: 25,000-35,000 vehicles
The Real Corridor Simulated
• Typical suburban corridor
• Difficult to retime
• Seasonal and annual variations in traffic flow
Evacuation route
Divided 4-6 lane facility
Left turns
RR crossing & school zones
35-50 mph
Direct Comparison in 5 Conditions
Regular traffic conditions
Freeway incident
Inclement weather
Shock traffic
Frequent rail
Conducting the Microsimulation
Collect data
Build model in VISSIM
Calibrate and validate the model
Finally, TEST IT under hundreds and hundreds
of hours of microsimulation using different
signal timing strategies
Three sets of TOD plans
1. SS – Single Section method
2. MS – Multiple Sections method
3. Actual signal timings in field
Direct Comparison
Optimized TOD
Timing Plans
• Very consistent results – InSync nearly always
better than optimized TOD plans
• Significant improvements – stops reduced up
to 33%, delay reduced up to 32%
• Confident conclusion that InSync is better than
TOD plans
“The results are representative—
and the fact that they are
representative will help traffic
signal engineers to confidently
make the decision to move
toward adaptive traffic control
systems in the future.”
- Dr. Stevanovic
Who’s using InSync?
80+ public agencies at 991 intersections in 25 states
Learn more about these results
Watch the recorded webinar and
download the full study at
Questions, comments, more information?
Eric Gannaway, Great Lakes Regional Manager
Rhythm Engineering
[email protected]
(586) 612-8660

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