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EECBG signal timing / optimization project

Project Background

Retiming of traffic signals is one of the most cost effective ways an agency can improve the traffic flow in their community. Improved traffic flow allows for a reduction in travel times, traffic delays, number of stops, thereby reducing average fuel consumption and average vehicle emissions.

In 2009 the City of Bloomington received federal money awarded through the Energy Efficiency and Conservation Block Grant Program (EECBG) as part of the American Recovery and Reinvestment Act to perform a traffic signal timing optimization and coordination project.

Project goals included improving overall network efficiency and providing for more efficient use of the existing roadway capacities by reducing vehicle stops, vehicle queuing / stacking, and reducing overall delay.

Project tasks included:

  • Collecting traffic data (traffic volume counts and travel time studies).
  • Conducting a roadway and signal system inventory and evaluating the existing quality of traffic flow.
  • Conducting a signal system hardware and communication components assessment.
  • Conducting a coordination feasibility study to determine coordinated zones, operation strategies, communication needs and agency maintenance and operation responsibility (referred to in the following document as indexes).
  • Identifying communication and equipment upgrades/improvements that could be implemented now or in future.
  • Developing traffic models to support preparing new signal system timing coordination plans for various corridors.
  • Installing new traffic signal controller equipment and communication devices to extent the project budget allowed.
  • Developing and implementing optimized timing plans, and corridor synchronization (coordination) where appropriate.
  • Implementing new timing plans and fine-tuning them to real traffic conditions.
  • Conducting a "before" and "after" analysis and documenting the project benefits.

Conducting a comprehensive evaluation of project corridors and providing the City of Bloomington with low cost intersection improvements to further maximize operational efficiencies.

The signal timing optimization project was one of four City projects funded through the Energy Efficiency Conservation Block Grant (EECBG) Program. More information on the grant program and other three City projects is available on the City's Energy efficiency conservation block grant web page.

Project report


Signal Timing Background