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SPM Basics & Applications Overview
Mark Taylor
January 27, 2016
Mark Taylor, P.E., PTOETraffic Signal Operations [email protected]
1
SPM Basic Concept
- Signal controller- Probe source
- Signal- Corridor- System
Automated Data Collection
Useful Information about Performance
System Requirements for SPM’s
3) Server
4) Website
1) High-resolution Controller
5) Detection (optional)Can be done independent of a central system!
2) Communications Econolite Cobalt: Any Version Econolite ASC3 NEMA: V. 2.50+ & OS 1.14.03+ Econolite 2070 with 1C CPU Module: V. 32.50+ Intelight Maxtime: V. 1.7.0+ Peek ATC Greenwave 03.05.0528+ Trafficware 980ATC V. 76.10+ Siemens M50 Linux & M60 ATC
ECOM V. 3.52+ NTCIP V. 4.53+
McCain ATC Omni eX 1.6+
3
Controller EnumerationsEvent Code, Event Description, Parameter
High-resolution DataTimestamp, Enumeration Code, Parameter
Detector 5 OFF
Phase 8 GREEN
Detector 5 ON
http://udottraffic.utah.gov/signalperformancemetrics
Coordination Optimization Example: Progression Quality
Vehicles arrive on green
Vehicles arrive on yellow
Vehicles arrive on red
One approach shown
Metric: Purdue Coordination DiagramDetection Requirements: Advance Counters
7
Purdue Coordination DiagramBangerter & 5400 S (3/7/2013)
8Metric: Purdue Coordination DiagramDetection Requirements: Advance Counters
Approach Speeds
Bluff & 100 S, St. George, NB
Use 85th percentile to set yellow & redclearance intervals
Posted speed
Metric: Approach SpeedsDetection Requirements: Wavetronix Advance Radar
9
Operations & Traffic Study Example:Vehicle Speeds at Intersections
Metric: Approach SpeedsDetection Requirements: Wavetronix Advance Radar
Snow Storm Starts
10
Approach Volumes
Metric: Approach VolumesDetection Requirements: Advance Counters
When to take a lane for maintenance Directional splits for offset optimization Network models
11
Lane-by-Lane Volume CountsUse for traffic studies, models, adjust splits, coordination balance
Metric: Turning Movement CountsDetection Requirements: Stop Bar Counters
12
Red Light MonitoringUse for identifying safety trends and engineering countermeasures
Metric: Red Light MonitoringDetection Requirements: Stop Bar Counterswith speed filter or detectors in intersection13
Red Light Monitoring
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Is green time too short? – Would increasing the split fix the problem? Is coordination poor? – More vehicles arriving on green could fix this? Is sight distance poor? – Are their trucks or other obstructions blocking signal? Is law enforcement needed? – Time can be pinned down for law enforcement.
Analysis: 7:00 AM to 8:15 AM - May 18, 2015
Metric 1: Purdue Coordination DiagramDetection Requirements: Advance
Metric 2: Purdue Travel Time DiagramRequirements: Probe data set 15
Sunnyside Avenue
1300 S
2300 E
1700 S
2100 S
Foothill Boulevard
+3%
+18%
+13%
+4%
-3%
+8%
+1%
+5%
+20%
+35%
-3%
-2%
-1%
+5%
14%
-1%
Initial Percent Arrival on Green
Increase in Percent Arrival on Green
Decrease in Percent Arrival on Green
Corridor Midday Arrival on Green
74%
7%
2013Purdue Coordination
Diagrams
Sunnyside Avenue
1300 S
2300 E
1700 S
2100 S
Foothill Boulevard
0%
+9%
+2%
+2%
-7%
+7%
-6%
+7%
+7%
+13%
+6%
+4%
-1%
-3%
-1%
-1%
77%
2%
-1%
Initial Percent Arrival on Green
Increase in Percent Arrival on Green
Decrease in Percent Arrival on Green
Corridor Midday Arrival on Green
2015Purdue Link Pivot