Syncro green. Adaptive Traffic Control System
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SynchroGreen improved travel time and decreased delay during all time periods.

Seminole County, Florida

SR 436 between Westmonte Drive and Maitland Avenue is a 1.7 mile roadway segment in Seminole County, Florida involving 12 traffic signals. SR 436 is a minimum six lane roadway section within the study area and has an Average Daily Traffic (ADT) volume of approximately 59,600. This study compares traffic operations while SynchroGreen was active and inactive.

Problem

Within a span of 24 hours, over 1,100 pedestrian calls have been recorded within the study area. Due to this high pedestrian volume and large pedestrian clearance intervals required to cross six or more traffic lanes, traffic signals frequently entered transition mode and maintaining traffic signal coordination on SR 436 was difficult. Seminole County staff have adjusted the signal timing on SR 436 in response to changing traffic conditions through routine maintenance and retiming studies. Despite these adjustments, the unpredictable nature and day-to-day fluctuation on this corridor are not conducive to actuated-coordinated operations.

SynchroGreen

SynchroGreen was selected by Seminole County as their adaptive control solution and was deployed in May 2011. SynchroGreen provides an intuitive interface and platform to implement real-time adaptive control. SynchroGreen collects traffic data at intersections over time, analyzes it for changing trends and adjustments are programmed into the traffic signal controllers. SynchroGreen does not operate using fixed cycle lengths. Instead, “periods” are used to define the length of time to service all phases. “Start time” replaces the traditional offset using SynchroGreen. As the period and traffic flow changes, the greenband start time for each intersection is adjusted. The updated start time calculation promotes better progression along the main-street.

Objectives

  • Reduce Arterial Travel Time
  • Reduce Arterial Delay
  • Reduce Stops
  • Reduce or Maintain Side-Street Delay
  • Reduce or Maintain Pedestrian Delay
  • Reduce Emissions

Results

SynchroGreen improved travel time and delay for all time periods. Mid-day travel time runs demonstrated the greatest improvement, where eastbound travel time was reduced by 27 percent and westbound was reduced by 25 percent. Similarly, delay was reduced by 46 percent eastbound and 37 percent westbound during the mid-day peak. SynchroGreen was not only shown to reduce arterial travel time and delay, but also side-street delay and pedestrian delay. On average, sidestreet delay reduced by 19 percent, while pedestrian delay reduced by 10 percent. Fuel consumption was reduced a minimum of 8 percent during all time periods, resulting in fewer HC, CO and NOx emissions.

Discussion

Improvements are attributed to periods that minimize the time between successive greenbands and start times that recalculate each period in order to facilitate progression. SynchroGreen is also capable of accommodating the large pedestrian volume identified as a major obstacle towards providing consistent traffic signal coordination. SynchroGreen can adjust phase allocation, periods and start time when a pedestrian call is received to minimize the impact to the main-street.

White Paper: Seminole County SR 436 Deployment

 

For a detailed discussion of the SR 436 deployment, click here.