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Charlie Wetzel , PE, PTOE County Traffic Engineer Seminole County Florida PowerPoint Presentation
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Charlie Wetzel , PE, PTOE County Traffic Engineer Seminole County Florida. Marshall Cheek , PE, PTOE Traffic Engineer Trafficware. Outline . Who is Seminole County? County Operations Philosophy Why SynchroGreen? Benefits Basics SynchroGreen Analysis Web Interface

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slide1

Charlie Wetzel, PE, PTOE

  • County Traffic Engineer
  • Seminole County Florida
  • Marshall Cheek, PE, PTOE
  • Traffic Engineer
  • Trafficware
outline
Outline
  • Who is Seminole County?
  • County Operations Philosophy
  • Why SynchroGreen?
    • Benefits
    • Basics
  • SynchroGreen Analysis
  • Web Interface
  • SR 436 Project
  • Future Projects
  • Questions
who is seminole county
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
who is seminole county4
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
who is seminole county5
Who is Seminole County?
  • Traffic Engineering Division – 33 people, 2 PEs
  • Signal Section – 9 technicians
  • Fiber Section – 7 technicians (including 1 locator)
  • Retiming activities – goal once every 3 years, funding: $190k from MPO, $150k from County funds
  • Countywide travel-time study conducted annually
  • Annual Budget :
    • Division - $4.8M O&M, $1.5M Capital Projects (penny sales tax)
    • Signal Section - $2M O&M (includes salaries, $150k retiming)
    • Fiber Section - $800k O&M
  • ATMS Grants (MPO/FDOT) - $3M in 1999, $4M in 2011
county operations philosophy
County Operations Philosophy
  • Department Vision – “Successfully provide a multi-modal transportation system that addresses the needs of the citizens of Seminole County by enhancing mobility, maximizing alternative funding sources, maintaining a safe and efficient transportation system and improving water quality.”
  • Number 1 need – secure dedicated source of funding for transportation following expiration of 1 cent sales tax in 2011.
  • Operations constraints – manpower and funding
  • O&M Policies – 2 hr response to priority 1 trouble calls (averaging 30 minutes), 24 hr initial response to citizen complaint, follow-up ASAP
why synchrogreen
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
benefits of synchrogreen
Benefits of SynchroGreen
  • 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
synchrogreen basics
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
synchrogreen basics10
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 can be any reliable technology
    • Inductive loops, Video, Wireless, Radar
optimization strategies
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
optimization engines
Optimization Engines
  • Phase Allocation (splits) are determined by:
    • Green Utilization
    • Detector Calibration Factor
  • Period (cycle)
  • Start Time (offset) adjusted based on platoon behavior/distribution
detection
Detection
  • Stop bar
    • All lanes must have stop bar detection
  • Advanced (free flow)
    • Advanced detection on main street only
    • Behind 85th percentile queue
  • Detection must be reliable
    • SynchroGreen can identify inaccuracies
    • SynchroGreen can correct inaccuracies
analysis phase allocation
Analysis - Phase Allocation
  • Phase allocation is calculated in real-time
  • Occupancy during effective green is green utilization
  • Green utilization creates target phase allocation

TARGET PHASE ALLOCATION

SYNCHROGREEN

(SELECTED PERIOD)

ACTUAL PHASE ALLOCATION

analysis periods
Analysis - Periods
  • “Period” between green bands
  • Cycle-less Operation
  • Changes based on system demand
  • Minimize time between successive green bands
  • Selected period determines actual phase allocation

TARGET PHASE ALLOCATION

SYNCHROGREEN

(SELECTED PERIOD)

ACTUAL PHASE ALLOCATION

analysis start time
Analysis - Start Time
  • Green band start time
  • Transition-less adjustment
  • Start time recalculates due to:
    • Period changes
    • Traffic flow changes
  • Lag Time
    • Reacts to queues
    • Reacts to platoon arrival
  • Advanced detectors allow adjustment
interface
Interface
  • Easy interface
  • Simple inputs
interface18
Interface
  • Monitor adaptive status

STARTUP

MONITOR

simulation
Simulation
  • Can model adaptive traffic control
  • Integrates with SynchroTM and SimTrafficTM
  • Calibrate adaptive settings before deployment
  • Compare adaptive system to TOD operation
sr 436 project
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
sr 436 deployment22
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
sr 436 before after study
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)
sr 436 results
SR 436 Results

AM 150 -> 142

MD 160 -> 141

PM 200 -> 155

sr 436 project summary
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)
  • Working with Trafficware for more user options and enhanced web interface
  • Expanding SR 436 by 4 additional signals
synchrogreen costs
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)
future projects
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
questions or comments
Questions or Comments
  • Charlie Wetzel, PE, PTOE
  • cwetzel@seminolecountyfl.gov
  • Marshall Cheek, PE, PTOE
  • marshallcheek@trafficware.com