1. green lights program objectives improve quality of synchronization in a short timeframe...
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Green Lights Program Objectives
• Improve Quality of Synchronization in a Short Timeframe
• Noticeable Improvements to Motorists
• Appropriate Allocation of Green Time
• Less Stops and Delays
• Fuel Savings and Environmental Benefits
What is Traffic Synchronization?
• A Mathematical Method of Optimizing the Movement of Vehicles Along a Roadway or Network
• Signal Cycle Length (Typically 120-180 seconds)• Allocation of Green Time to Different Phases (“Splits”)• Timed Stop & Release between Intersections (“Offsets”)
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[NORTH]
A Street
A Street
B Street
C Street
D Street
E Street
F Street
TIME
= GREEN PHASE MAJOR STREET = RED PHASE MAJOR STREET
Average-Quality Signal Progression
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[NORTH]
A Street
A Street
B Street
C Street
D Street
E Street
F Street
TIME
= GREEN PHASE MAJOR STREET = RED PHASE MAJOR STREET
High-Quality Signal Progression (Goal)
Already Retimed over 950 Intersections:
All Major E/W & N/S
Corridors
Future Areas (In Blue) Require Additional
Equipment to Coordinate Signals
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Green Lights Retiming Initial Benefits:
• Delay Reduction: 15% - 42%• Reduction in Stops: 10% - 32%• Improved Travel Times: 10% - 43%• $14.4 Million/Year Fuel Saved• 300,000 Metric Tons GHG Emissions Reduced• Positive Feedback from Motorists…
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“…on University Drive… I COULD NOT BELIEVE IT! I went from Southgate Blvd to Broward Blvd, an 8 mile stretch, cruising without stopping. It has never happened in my 22 years of driving on that road!!!”
- P. Veliyathil
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Next Corridor Retiming Steps:• Our work has just begun…program will
continue into the foreseeable future…
• Continuous Refinements• Troubleshoot Congestion “Hotspots”• Integrate Minor and Off-System Intersections• Enhanced Field Maintenance• “Traffic-Responsive’ & “Adaptive” Systems
Re-timing of Intersecting Roads
will be More Complicated…
Ultimate Goal:Complex N/S & E/W Cross-Progression:
“Basketweave”
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Next Corridor Retiming Steps (Cont’d):
Related Efforts:• Modernization of the Countywide Signal System
(SEI Program)
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New Signal ControlSoftware Will Improve System Performance• More Flexible Timing Patterns• More Reliable – Local Control at Intersections• Remote Monitoring at TMC in Real-Time• Enhanced Incident Management• Improved Priority Operation for Transit Buses (TSP)
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Hybrid Deployment of Technologies will Minimize Costs
• Digital Communications Network Required• Multiple Interoperable Options Now Available• Digital-Over-Copper• Wireless• Cellular• Fiber Optics
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New Software Implementation Schedule
• Operational at over 200 Intersections Today• Convert 400 More Intersections by end of 2013• Remaining 675 Intersections by end of 2015• Total to be Upgraded = 1,275
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New Software Implementation Includes the Following:
• Digital-Over-Copper Network Switches/Routers• Signal Timing Database Conversion• Some Copper Cable Replacement w/ Fiber Optics• Replacement of Existing 23 Year Old Mainframe• Cost = $20+ Million Over Next 4 Years
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Timing is Everything…Questions?
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www.broward.org/TRAFFIC/GREENLIGHTS
(954) 847-2600