Traffic Signal Retiming

Traffic Signal Retiming


Retiming the interval in which a traffic signal operates is crucial, often overlooked, and a cog in the modern traffic system. A municipality’s availability of resources is a strong influence on the feasibility of a signal retiming project. Signal retiming should be an ongoing and adaptive project. The importance of recurring studies is due to the unpredictability of traffic and constantly changing policies and environmental conditions. Traffic signals that are not timed efficiently to accommodate vehicular traffic can cause travel delays, increased accident rates, increase pollution from vehicle emissions, and increase fuel consumption among other concerns. 



SMATS iNode™ can provide on-demand travel-time, speed, and delay data for signalized arterial roads. Cities and counties use iNode™ powered by crowdsourcing traffic data to analyze delays, prioritize corridors in need of signal retiming, and run before and after studies to see the impact of signal retiming projects. 

Corridor Speed Comparison for Before and After Periods

Corridor Travel Time Comparison for Before and After Periods

Travel Time and Speed Data Collection Links set in iNode for Signalized Intersection

Cost and Benefit of Retiming

It has been shown that the benefit of signal retiming far outweighs the cost. In a report posted by the Institute of Transportation Engineers (ITE), it was found that the total benefit-cost ratio of signal retiming is 40:1!

The immense benefits brought by optimizing a signalized road can be seen through factors other than just financial savings. An efficient signal cuts down delay, unnecessary stops (and thus congestion) and overall vehicle collisions. The initial investment into signal retiming may be costly, but the ROI is clear, as roads become safer and more efficient.

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