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Metro Public Works Implementing New Signal Timing and Traffic Management System

12/16/2015

Public Works is working on two projects simultaneously, to significantly improve traffic flow throughout the county. These projects will give us state of the art tools needed to effectively manage traffic now and in the future.

Project 1

View 2016 Countywide Traffic Signal Coordination Project Presentation 

Traffic Signal Timing Optimization Project – 19 Groups of Traffic Signals to be Optimized on Nashville’s major traffic corridors:

  • Project intent is to implement timing plans and monitor their effectiveness, in order to reduce the unnecessary vehicle stops and delays that result from dated signal system timings.
  • 19 total groups of traffic signals are proposed for optimization – these are for the major arterial roads. (This includes approximately 560 signalized intersections). Additional traffic signal timings may be requested on an on-call basis.
  • Time of Day plans for each intersection will be developed based on traffic counts at each intersection. Weekday time of day plans for the AM peak, mid-day peak, and PM peak times will be developed. Timing plans will also be developed for off peak periods, including week nights, weekends, holidays, and special events as necessary.
  • Project tasks include Data Collection, Intersection Inventory and Review, Existing Conditions Analysis, Development of New Coordinated Timings, Field Implementation of Timings, Before/After Travel Time and Delay Studies, and Final Documentation
  • Project is scheduled to be completed in 2016. Below is a general schedule of project tasks:
    • Winter Spring: Data Collection / Inventory /Travel Time Study (June 2016 Update: 100% complete)
    • Spring/Summer: Analysis (June 2016 Update: Engineering calculations and modeling process are underway)
    • Summer/Fall: Implementation
  • Additional traffic signal timings may be requested as needed. The 19 groups are listed below:
    • Group 1 – Charlotte Pike (55 traffic signals)
    • Group 2 – Korean Veterans Boulevard/Shelby Avenue (21 traffic signals)
    • Group 3 – 21st Avenue South (17 traffic signals)
    • Group 4 – West End Avenue/Harding Pike (50 traffic signals)
    • Group 5 – Nolensville Road (47 traffic signals)
    • Group 6 – Hermitage Avenue/Lebanon Road (32 traffic signals)
    • Group 7 – Gallatin Pike (73 traffic signals)
    • Group 8 – Metro Center/Rosa Parks Boulevard/Jefferson Street (26 traffic signals)
    • Group 9 – Downtown Nashville (99 traffic signals)
    • Group 10 – Hillsboro Road (22 traffic signals)
    • Group 11 – Harding Place (18 traffic signals)
    • Group 12 – Donelson Pike (7 traffic signals)
    • Group 13 – Bell Road (19 traffic signals)
    • Group 14 – Haywood Lane (5 traffic signals)
    • Group 15 – James Robertson Parkway (6 traffic signals)
    • Group 16 – Highway 70 South (14 traffic signals)
    • Group 17 – Franklin Road (15 traffic signals)
    • Group 18 – Dickerson Road (19 traffic signals)
    • Group 19 – Clarksville Pike (15 traffic signals)

Project 2

Traffic signal controllers and software project:

  • This new traffic signal controller and software network will allow communications between signals to a central controller giving us more reliability, future computerized interaction with transit operations, less maintenance costs, and the ability to adjust signals in real time as needed.
  • Metro has installed new servers and has initiated installation of 200 new controllers.
  • Installation of the new traffic signal management software, improved communication infrastructure, and the first 200 controllers will continue throughout the next several months. Over this spring and summer, an additional 400 new controllers will be installed.

Metro Public Works has additional signal timing optimization projects on Murfreesboro Pike and Old Hickory Boulevard. These projects will work to further improve traffic flow on busy corridors in Nashville and Davidson County.