Adaptive signal control at Maine’s busiest intersection was estimated to reduce intersection delays by 20 percent.

A periodical highlights findings from a Maine DOT study.

City of Portland; Maine; United States

Summary Information

According to a 2016 report from the Maine Department of Transportation (MaineDOT) the Morrill’s Corner intersection system sees 33,000 vehicles pass through it each day. Using real-time data and artificial intelligence (AI) a Surtrac real-time adaptive signal control strategy was implemented to coordinate traffic control depending on actual traffic demands in the area. The system was designed to optimize signal timing every second, allowing the system to adapt quickly to changes in traffic patterns. Because the system was decentralized, latency was not an issue.


An assessment conducted at three intersections in Morrill's Corner found that the system decreased delay by 20 percent saving each traveler an average of 17 seconds. Equivalent commuter travel time savings were estimated at of 9,350 minutes, or approximately 156 hours each business day.

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Portland Reduces Delays by 20% at Maine’s Busiest Traffic Intersection After Surtrac Deployment

Published By: Rapid Flow Technologies

Source Date: 03/18/2019



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Goal Areas


Typical Deployment Locations

Metropolitan Areas


traffic signals, adaptive signals

Benefit ID: 2020-01454