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Charlie Wetzel, PE, PTOE
County Traffic Engineer
Seminole County Florida
Signal
Performance
Metrics
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• Purdue University introduced Purdue Coordination Diagram
Concept (2009)– “visualize the temporal relationship between
the
coordinated phase indications and vehicle arrivals on a
cycle-by-cycle basis”
• Joint Research Program with Indiana DOT, Purdue University,
Econolite, PEEK, and Siemens - Indiana Traffic Signal Hi Resolution
Data Logger Enumerations
• Utah DOT worked with Purdue and INDOT to develop SPM website
(2012)
Brief History of SPM
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• Advanced Loops for Full Reporting, Simple Communications for
Split/Phase Data
• Supported Controllers– Econolite - Cobalt (Any firmware),
ASC/3 NEMA (App version
2.50.00+ and OS 1.14.03+), 2070 with 1C CPU module (32.50+)
– Intelight - MaxTime (1.7.0+)– Peek - ATC Greenwave
(03.05.0528+)– TrafficWare - 980 ATC (76.10+)– Siemens - M50 Linux
/ M60 ATC (ECOM 3.52+, NTCIP 4.53+)– McCain?
• UDOT software
What You Need
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• Worked with FDOT and UDOT to start the initial installation in
January 2015
• After break in firewall configured, link went “public” in
February 2015
• Initial deployment – 39 signals
• Currently at 207 signals
• Using Trafficware (Naztec) ATC Controllers and advance
loops
• Computer/storage requirements (ave 23MB per day per controller
– for 200 controllers this is 4.4G per day and 1.7T per year)
Seminole County SPM Deployment
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Setup
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• SPM Configuration Tool – Add New Signal
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Signal Setup
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• SPM Configuration Tool – Detector Setup
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Main Screen
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Metric - Purdue Coordination Diagram
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Metric – Arrivals on Red
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Metric – Approach Delay
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Metric – Approach Volume
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Metric – Purdue Phase Termination
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Metric –Split Monitor
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• Recent consultant retiming project– Looked at AoG to adjust
offsets–Reviewed Gap Outs to find extra time
• Before/After or On/Off studies
Current Uses
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On/Off Analysis
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UDOT’s SPM Site
http://udottraffic.utah.gov/signalperformancemetrics
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Metric –Red Light Monitor
Metric –Speed
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Metric –Turning Movement Counts
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Purdue Link Pivot
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• Another tool in the Traffic Engineer’s Tool Box– Coordination
improvements / retiming– Maintenance– Before/after (on/off)
studies
• Great first step– Further development on reporting (range
options, historical
comparisons), possible optimization would go a long way
• Staff and/or time needed to run reports and analyze results–
We’ve requested new person for next fiscal year– Consultant could
run time-based reports– For us, it should coordinate well with FDOT
D5’s proposed
AAM efforts
Take Away
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• Big question – how will new SPM systems in Florida be
implemented and who will do them?–Consultants–Manufacturers
Take Away
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ATMS.Now Purdue Logging
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Questions or Comments
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Charlie Wetzel, PE, PTOE
[email protected]
http://spm.seminolecountyfl.gov/signalperformancemetrics/
