1. green lights program objectives improve quality of synchronization in a short timeframe...

1

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”)

4

[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

5

[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

6

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…

7

“…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

8

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”

9

Next Corridor Retiming Steps (Cont’d):

Related Efforts:• Modernization of the Countywide Signal System

(SEI Program)

10

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)

11

Hybrid Deployment of Technologies will Minimize Costs

• Digital Communications Network Required• Multiple Interoperable Options Now Available• Digital-Over-Copper• Wireless• Cellular• Fiber Optics

12

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

13

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

14

Timing is Everything…Questions?

15

TRAFFIC@Broward.org

www.broward.org/TRAFFIC/GREENLIGHTS

(954) 847-2600