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Charlie Wetzel, PE, PTOE County Traffic Engineer Seminole County Florida

Charlie Wetzel, PE, PTOE County Traffic Engineer Seminole County Florida. 1 0/18/11. Outline . Who is Seminole County? Why SynchroGreen? SynchroGreen Basics SR 436 Project Future Projects Questions. 10/18/11. Who is Seminole County?.

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Charlie Wetzel, PE, PTOE County Traffic Engineer Seminole County Florida

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  1. Charlie Wetzel, PE, PTOE County Traffic Engineer Seminole County Florida 10/18/11

  2. Outline • Who is Seminole County? • Why SynchroGreen? • SynchroGreen Basics • SR 436 Project • Future Projects • Questions 10/18/11

  3. Who is Seminole County? • County located between Orange County (Orlando), Volusia County (Daytona Beach) and Brevard County (Cocoa Beach) • Population: 422,718 (2010) • Area: 345 sq. miles • 7 Cities • Varying traffic – tourists, events, retail, business 10/18/11

  4. Who is Seminole County? • Traffic signals – own/partially own 240, maintain 370 (all but 7 in the County) • Communications – 99% with comm., 33 signals on radio, rest on fiber (350+ miles), 4 with no comm. • Detection – primarily loops, 8 with full video, 12 with partial video (adaptive project) • Controller equipment – Naztec NEMA TS2, ATMS.Now central software • Staff – 9 in Signal Section, 7 in Fiber Section • Retiming activities – goal once every 3 years, funding: $190k from MPO, $150k from County funds • ATMS Grants (MPO/FDOT) - $3M in 1999, $4M in 2011 10/18/11

  5. Why SynchroGreen? • Looking for alternatives to TOD plans – varying traffic, pedestrian and pre-emption issues • Waiting for developments in adaptive, as opposed to going responsive • Only other adaptive in the area is SCOOTS in Orange County (mixed results) • Familiar with Trafficware - we use SynchroTM and SimTrafficTM • Learned that Naztec and Trafficware wanted to team up and we offered to implement and test the first SynchroGreen system 10/18/11

  6. SynchroGreen Basics • Utilizes standard NTCIP • No hardware – no “black box” or anything needing FDOT approval • Uses SynchroGreen “MIB” inside the controller • Adjusts signal timings based on real-time traffic • Can use existing infrastructure (controllers, detection) • Can turn on/off by time-of-day • Will revert to time-of-day plan when off or loss of comm. • Considers overall network delay; not just main street 10/18/11

  7. SynchroGreen Basics • Uses central WindowsTM based PC or server • Collects detector data from local intersections • Occupancy (stop bar detection) • Platoon behavior/distribution (free flow detection) • Communications via Ethernet • Performs calculations to determine optimal timing parameters • Uploads timings and continues to monitor local intersections 10/18/11

  8. SynchroGreen Basics • Can turn on/off adaptive mode instantly • Local controller setup is minimal (existing settings remain – phase and clearance times) • SynchroGreen does not modify sequences; this is handled by background time of day sequences • Detection: • Any reliable technology (loops, video, wireless, radar) • Stop bar • All lanes must have stop bar detection • Advanced (free flow) • Advanced detection on main street only • Behind 85th percentile queue 10/18/11

  9. Optimization • Splits – Phase Allocations • Cycles – Periods • Offsets – Start Times 10/18/11

  10. Optimization - Phase Allocations • Occupancy of detection zone is measured during the effective green of that phase yielding a green utilization • Detector calibration factor, based on characteristics of detection zone (length, type, grade), is applied to green utilization • Target (desired) phase allocation is then calculated in real-time 10/18/11

  11. Optimization – Periods Sample phase targets used to determine the period plan (cycle) below Note that 149 second period was selected for all locations based on the target value of the highest intersection 10/18/11

  12. Optimization - Start Times • Adjusted based on platoon behavior/distribution using advanced detectors • Transition-less adjustment • Start times recalculate due to: • Period changes • Traffic flow changes • Lag Time • Reacts to queues • Reacts to platoon arrival 10/18/11

  13. Optimization Strategies • SynchroGreen Balanced Mode • Minimizes network delay • SynchroGreen Progression Mode • Favors progression along the corridor • SynchroGreen Critical Movement Mode • Focuses on critical movements, while minimizing delay 10/18/11

  14. Interface STARTUP SETUP MONITOR 10/18/11

  15. Simulation • Integrates with SynchroTM and SimTrafficTM • Can model adaptive traffic control • Calibrate adaptive settings before deployment • Compare adaptive system to TOD operation 10/18/11

  16. SR 436 Project • 12 Signalized Intersections on State Road 436 • Previously actuated/coordinated system • 1.7 miles • 59,600 ADT • Heavy Pedestrian Activity (>1,100 peds/day) • Preemption requests (>150 requests/day) • Challenging corridor to test SynchroGreen 10/18/11

  17. SR 436 Deployment 10/18/11

  18. SR 436 Deployment • Deployed May 2011 • Naztec 980 TS2 Controllers • Used existing inductive loops (side streets and left turns) • Installed new video detection (main street stop bar and advanced) • Received in-field training on operation and calibration 10/18/11

  19. SR 436 Before/After Study • Travel Time (AM: -6%, MD: -26%, PM: -12%) • Delay (AM: -12%, MD: -42%, PM: -19%) • Stops (AM: -25%, MD: -36%, PM: -20%) • Side-street Delay (-19% ave. at 2 sample locations) • Environmental MOEs • Fuel consumption (AM: -10%, MD: -22%, PM: -12%) • HC, CO, NOx Emissions – similar to other results • All determined using Tru-Traffic, with exception of side-street (HCM) 10/18/11

  20. SR 436 Results AM 150 -> 142 MD 160 -> 141 PM 200 -> 155 10/18/11

  21. SR 436 Project Summary • Traffic conditions were difficult; however, SynchroGreen showed improved operations (decreased travel time, delay and stops) • Greatest improvements during non-peak periods • Significant improvements for pedestrian and pre-emption transitions • We are still experimenting with the system. • Many options haven’t been tried yet (start time modifications, different mode types, calibration using Synchro and SimTraffic) • Expanding SR 436 by 4 additional signals 10/18/11

  22. SynchroGreen Costs • Base price - $13,500 per intersection • Initial Corridor Setup/Training – Varies depending on # signals/complexity, available Synchro models, etc. ($5k to $12k) • Extras: • Additional training (estimate $7,500) • Server (estimate $8k) • Before/after studies (estimate $5k) • Detection (varies) 10/18/11

  23. Future Projects • Implementing on other corridors (Lake Mary Blvd, SR 46, CR 46A, US 17/92 and other sections of SR 436). • Installing at 43 additional locations using our $4M grant • Considering alternate detection methods (wireless, loops) • New loop standard in the County to accommodate adaptive • Working with Bluetooth technology to monitor the corridor 10/18/11

  24. Questions or Comments Charlie Wetzel, PE, PTOE cwetzel@seminolecountyfl.gov 10/18/11

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